Created by: nickpalmer
Summary: This change set adds a build_config generator that knows how to generate the BuildConfig.java files generated by existing build tools. This addresses issue: https://github.com/facebook/buck/issues/3 and is based on the strategy proposed in the comment on that issue.
Test Plan: There are already unit tests in place which verify all but the contents of the generated file. To verify contents add a build_config rule to a project and dig into buck-out to verify the contents of the file are correct.