Rename test input files.

Append ".in" suffix to syntactically invalid test input files. This
makes my local triggers happy (otherwise they will try to `go fmt` them
and fail, and it's becoming annoying now).
Merge branch 'rename_test_files' of https://github.com/tiziano88/gocode
add "autobuild" option (no-op for now)
autobuild skeleton
WIP