Created by: kageiit
This adds support for manifest placeholders: http://tools.android.com/tech-docs/new-build-system/user-guide/manifest-merger#TOC-Placeholder-support
Resolves #743 (closed)
Many components of libraries like Google Play Services etc. have an implicit ${applicationId} placeholder which gets replaced correctly by the android_binary's application id when building with gradle.
This PR enables buck to do the same and also support custom placeholders at the same time by adding an optional placeholders entry to the manifest_entries configuration.