Fix antlr sources

Review Request #679 - Created July 15, 2014 and submitted

Information
Stu Hood
pants
stuhood/antlr-round-two
Reviewers
pants-reviews
areitz, jsirois, tejal
This fixes an issue where CacheValidator's source hashing was failing on the synthetic targets generated by AntlrGen, since the assumed source paths mismatched the actual generated paths.

- Adds an integration test for antlr4 codegen
- Uses sources_relative_to_buildroot for the assumed output sources, since we can't control antlr's output relative paths very tightly without changing directories (which would circumvent nailgun) 
new and existing test(s)
John Sirois
Stu Hood
John Sirois
Tejal Desai
Stu Hood
Review request changed

Status: Closed (submitted)

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