Robolectric 2.4 is out

[TWiStErRob]

Travis build fails: https://travis-ci.org/bumptech/glide/builds/40527307
And local failure as well:

* Where:
Build file 'P:\projects\contrib\github-glide\glide\build.gradle' line: 3

* What went wrong:
A problem occurred evaluating project ':glide'.
> A problem occurred configuring project ':third_party:gif_decoder'.
   > Could not resolve all dependencies for configuration ':third_party:gif_decoder:_debugTestCompile'.
      > Could not find org.robolectric:robolectric:2.4-SNAPSHOT.
        Searched in the following locations:
            https://jcenter.bintray.com/org/robolectric/robolectric/2.4-SNAPSHOT/maven-metadata.xml
            https://jcenter.bintray.com/org/robolectric/robolectric/2.4-SNAPSHOT/robolectric-2.4-SNAPSHOT.pom
            https://jcenter.bintray.com/org/robolectric/robolectric/2.4-SNAPSHOT/robolectric-2.4-SNAPSHOT.jar
            https://oss.sonatype.org/content/repositories/snapshots/org/robolectric/robolectric/2.4-SNAPSHOT/maven-metadata.xml
            https://oss.sonatype.org/content/repositories/snapshots/org/robolectric/robolectric/2.4-SNAPSHOT/robolectric-2.4-SNAPSHOT.pom
            https://oss.sonatype.org/content/repositories/snapshots/org/robolectric/robolectric/2.4-SNAPSHOT/robolectric-2.4-SNAPSHOT.jar
            file:/P:/tools/android-sdk-windows/extras/android/m2repository/org/robolectric/robolectric/2.4-SNAPSHOT/maven-metadata.xml
            file:/P:/tools/android-sdk-windows/extras/android/m2repository/org/robolectric/robolectric/2.4-SNAPSHOT/robolectric-2.4-SNAPSHOT.pom
            file:/P:/tools/android-sdk-windows/extras/android/m2repository/org/robolectric/robolectric/2.4-SNAPSHOT/robolectric-2.4-SNAPSHOT.jar
            file:/P:/tools/android-sdk-windows/extras/google/m2repository/org/robolectric/robolectric/2.4-SNAPSHOT/maven-metadata.xml
            file:/P:/tools/android-sdk-windows/extras/google/m2repository/org/robolectric/robolectric/2.4-SNAPSHOT/robolectric-2.4-SNAPSHOT.pom
            file:/P:/tools/android-sdk-windows/extras/google/m2repository/org/robolectric/robolectric/2.4-SNAPSHOT/robolectric-2.4-SNAPSHOT.jar
        Required by:
            glide-parent.third_party:gif_decoder:unspecified