Bump version and update release notes

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=154198359

RELEASENOTES.md

 # Release notes #
 # Release notes #
 
 
+### r2.4.0 ###
+
+* New modular library structure. You can read more about depending on individual
+  library modules [here](TODO).
+* Variable speed playback support on API level 16+. You can read more about
+  changing the playback speed [here](TODO)
+  ([#26](https://github.com/google/ExoPlayer/issues/26))."
+* New time bar view, including support for displaying ad break markers.
+* Support DVB subtitles in MPEG-TS and MKV.
+* Support adaptive playback for audio only DASH, HLS and SmoothStreaming
+  ([#1975](https://github.com/google/ExoPlayer/issues/1975)).
+* Support for setting extractor flags on DefaultExtractorsFactory
+  ([#2657](https://github.com/google/ExoPlayer/issues/2657)).
+* Support injecting custom renderers into SimpleExoPlayer using a new
+  RenderersFactory interface.
+* Correctly set ExoPlayer's internal thread priority to `THREAD_PRIORITY_AUDIO`.
+* TX3G: Support styling and positioning.
+* FLV:
+  * Support MP3 in FLV.
+  * Skip unhandled metadata rather than failing
+    ([#2634](https://github.com/google/ExoPlayer/issues/2634)).
+  * Fix potential OutOfMemory errors.
+* ID3: Better handle malformed ID3 data
+  ([#2604](https://github.com/google/ExoPlayer/issues/2604),
+  [#2663](https://github.com/google/ExoPlayer/issues/2663)).
+* FFmpeg extension: Fixed build instructions
+  ([#2561](https://github.com/google/ExoPlayer/issues/2561)).
+* VP9 extension: Reduced binary size.
+* FLAC extension: Enabled 64 bit targets.
+* Misc bugfixes.
+
 ### r2.3.1 ###
 ### r2.3.1 ###
 
 
 * Fix NPE enabling WebVTT subtitles in DASH streams
 * Fix NPE enabling WebVTT subtitles in DASH streams
@@ -302,6 +333,12 @@ in all V2 releases. This cannot be assumed for changes in r1.5.12 and later,
 however it can be assumed that all such changes are included in the most recent
 however it can be assumed that all such changes are included in the most recent
 V2 release.
 V2 release.
 
 
+### r1.5.16 ###
+
+* VP9 extension: Reduced binary size.
+* FLAC extension: Enabled 64 bit targets and fixed proguard config.
+* Misc bugfixes.
+
 ### r1.5.15 ###
 ### r1.5.15 ###
 
 
 * SmoothStreaming: Fixed handling of start_time placeholder
 * SmoothStreaming: Fixed handling of start_time placeholder

build.gradle

@@ -48,7 +48,7 @@ allprojects {
         releaseRepoName = getBintrayRepo()
         releaseRepoName = getBintrayRepo()
         releaseUserOrg = 'google'
         releaseUserOrg = 'google'
         releaseGroupId = 'com.google.android.exoplayer'
         releaseGroupId = 'com.google.android.exoplayer'
-        releaseVersion = 'r2.3.1'
+        releaseVersion = 'r2.4.0'
         releaseWebsite = 'https://github.com/google/ExoPlayer'
         releaseWebsite = 'https://github.com/google/ExoPlayer'
     }
     }
     if (it.hasProperty('externalBuildDir')) {
     if (it.hasProperty('externalBuildDir')) {

demo/src/main/AndroidManifest.xml

@@ -16,8 +16,8 @@
 
 
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.google.android.exoplayer2.demo"
     package="com.google.android.exoplayer2.demo"
-    android:versionCode="2301"
-    android:versionName="2.3.1">
+    android:versionCode="2400"
+    android:versionName="2.4.0">
 
 
   <uses-permission android:name="android.permission.INTERNET"/>
   <uses-permission android:name="android.permission.INTERNET"/>
   <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
   <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerLibraryInfo.java

@@ -24,13 +24,13 @@ public interface ExoPlayerLibraryInfo {
    * The version of the library expressed as a string, for example "1.2.3".
    * The version of the library expressed as a string, for example "1.2.3".
    */
    */
   // Intentionally hardcoded. Do not derive from other constants (e.g. VERSION_INT) or vice versa.
   // Intentionally hardcoded. Do not derive from other constants (e.g. VERSION_INT) or vice versa.
-  String VERSION = "2.3.1";
+  String VERSION = "2.4.0";
 
 
   /**
   /**
    * The version of the library expressed as {@code "ExoPlayerLib/" + VERSION}.
    * The version of the library expressed as {@code "ExoPlayerLib/" + VERSION}.
    */
    */
   // Intentionally hardcoded. Do not derive from other constants (e.g. VERSION) or vice versa.
   // Intentionally hardcoded. Do not derive from other constants (e.g. VERSION) or vice versa.
-  String VERSION_SLASHY = "ExoPlayerLib/2.3.1";
+  String VERSION_SLASHY = "ExoPlayerLib/2.4.0";
 
 
   /**
   /**
    * The version of the library expressed as an integer, for example 1002003.
    * The version of the library expressed as an integer, for example 1002003.
@@ -40,7 +40,7 @@ public interface ExoPlayerLibraryInfo {
    * integer version 123045006 (123-045-006).
    * integer version 123045006 (123-045-006).
    */
    */
   // Intentionally hardcoded. Do not derive from other constants (e.g. VERSION) or vice versa.
   // Intentionally hardcoded. Do not derive from other constants (e.g. VERSION) or vice versa.
-  int VERSION_INT = 2003001;
+  int VERSION_INT = 2004000;
 
 
   /**
   /**
    * Whether the library was compiled with {@link com.google.android.exoplayer2.util.Assertions}
    * Whether the library was compiled with {@link com.google.android.exoplayer2.util.Assertions}