Factor out common variables for publishing

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=135215320

build.gradle

@@ -32,5 +32,10 @@ allprojects {
         compileSdkVersion=24
         compileSdkVersion=24
         targetSdkVersion=24
         targetSdkVersion=24
         buildToolsVersion='23.0.3'
         buildToolsVersion='23.0.3'
+        releaseRepoName = 'exoplayer'
+        releaseUserOrg = 'google'
+        releaseGroupId = 'com.google.android.exoplayer'
+        releaseVersion = 'r2.0.1'
+        releaseWebsite = 'https://github.com/google/ExoPlayer'
     }
     }
 }
 }

extensions/okhttp/build.gradle

@@ -43,11 +43,11 @@ dependencies {
 }
 }
 
 
 publish {
 publish {
-    repoName = 'exoplayer'
-    userOrg = 'google'
-    groupId = 'com.google.android.exoplayer'
     artifactId = 'extension-okhttp'
     artifactId = 'extension-okhttp'
-    version = 'r2.0.1'
     description = 'An OkHttp extension for ExoPlayer.'
     description = 'An OkHttp extension for ExoPlayer.'
-    website = 'https://github.com/google/ExoPlayer'
+    repoName = releaseRepoName
+    userOrg = releaseUserOrg
+    groupId = releaseGroupId
+    version = releaseVersion
+    website = releaseWebsite
 }
 }

library/build.gradle

@@ -92,11 +92,11 @@ android.libraryVariants.all { variant ->
 }
 }
 
 
 publish {
 publish {
-    repoName = 'exoplayer'
-    userOrg = 'google'
-    groupId = 'com.google.android.exoplayer'
     artifactId = 'exoplayer'
     artifactId = 'exoplayer'
-    version = 'r2.0.1'
     description = 'The ExoPlayer library.'
     description = 'The ExoPlayer library.'
-    website = 'https://github.com/google/ExoPlayer'
+    repoName = releaseRepoName
+    userOrg = releaseUserOrg
+    groupId = releaseGroupId
+    version = releaseVersion
+    website = releaseWebsite
 }
 }