Makes git an alias for hub.

Makes git an alias for hub, a command-line wrapper for git. Hub provides
commands for common git tasks such as browse, clone, cherry-pick,
compare, fetch, fork, and pull-request. See, http://hub.github.com
Refactors Brewfile install of Python and PHP.

Adds numerous formula to the Brewfile and moves Python and PHP formulae
into separate Brewfiles.
Removes inline comments from the .ackrc file.
Sets VISUAL editor to correct executable paths.

Sets the exported VISUAL editor variable to the correct executable path
for either the Sublime Text or BBEdit command line tool.