Upgrade to webmachine 1.10.1 (and be compatible w/ Erlang R16)

This multi-repo PR upgrades the webmachine (and bundled mochiweb)
version to 1.10.1. Among other fixes, the new versions of webmachine
and mochiweb no longer use parameterized modules, a feature which has
been removed from Erlang >= R16.

While, I've done some testing with R16B and things look good (and
despite the branch name) these patches upgrade wm and include a few
other compat fixes for R16, but erlang is left at R15B03 and things
work fine there too.

Note that the PR in opscode-omnibus is for testing only and will not
be merged.