Explicitly initialize the logger

Explicitly initialize the logging library.  See issue https://github.com/pantsbuild/pants/pull/305

Also added printing absolute path for BuildFile string to help clarify when the BUILD file in question is actually in the root.

Testing Done:
Added a typo in the root BUILD file.  Before the patch, an error message is printed when the name of the file should be output.  After the patch, the logging message is printed.

Bugs closed: 305

Reviewed at https://rbcommons.com/s/twitter/r/618/