Version 1.2.3

• Added a public API to allow other projects to extend the functionality of the plugin. The first plugin which is integrated is NBAndroid. Note however, that the new API is only usable for projects using Gradle 1.6 or later. Also, the support is rather experimental for every participant (This plugin, NBAndroid, Android build system and Gradle itself).
• Regression: Issue #25 is reintroduced as a side effect of providing a public API.