update nebula-bintray plugin to get newer gradle-bintray
Merge pull request #17 from rspieldenner/gradle-1.12

update nebula-bintray plugin to get newer gradle-bintray
[Gradle Release Plugin] - pre tag commit:  '1.12.12'.
[Gradle Release Plugin] - new version commit:  '1.12.13-SNAPSHOT'.
Merge branch 'gradle-1.12' into gradle-2.0

Conflicts:
	dependencies.lock
	gradle.properties
Update nebula-bintray to get new gradle-bintray