Add -I include/ to build-ct-suites target
Don't download index file

If all deps know where to download it, then don't download index file.
Update README to include multi dependency example
Merge branch 'patch-1' of git://github.com/yellow5/erlang.mk
Merge branch 'fix-test-include' of git://github.com/ahf/erlang.mk
Merge branch 'index_file' of git://github.com/nevar/erlang.mk