Adding erlang.mk to exclusion list.

Adding 'erlang.mk' to list of erlang bundles; it's seeing some adoption in the Erlang community for building Erlang apps, and at 1k lines of code at present can dominate an initial check-in, project skeleton, or small library.

See https://github.com/ninenines/erlang.mk for further details.
Merge pull request #1845 from lostcolony/patch-1

Adding 'erlang.mk' to vendor.yml exclusion list.