It's currently difficult to use ExoPlayer modules in other gradle
projects because they rely on constants and dependencies defined
in our own top level gradle file. This change moves the constants
into a separate file referenced directly from each module. It also
removes the need for the top level gradle file to declare a
dependency on com.novoda:bintray-release. This is now only needed
if "exoplayerPublishEnabled = true" is specified.
Issue: #2851
Issue: #2974
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=160272072
2a8eb5a2a1