Maven 3.0.5

This is the same formula in Homebrew before it was replaced by the newer
3.1.0 release.

There seems to be an outstanding issue in Maven with regards to their
migration from Sonatype Aether to Eclipse Aether, which causes projects
to not build with 3.1.0.

https://cwiki.apache.org/confluence/display/MAVEN/AetherClassNotFound

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Closes #209.
Remove erlang-r16.

erlang-r16 is now packaged in core; will update it here when
r17 comes out.
PostgreSQL 9.2.x