Removed proxy setting from .gitconfig.

Since this setting is always set on in the environment as http_proxy it does not need to be redundantly set in the .gitconfig as well.
Added empty statement to bashrc for do not configure proxy.

Cygwin complained of an error when loading the bashrc since there was an else condition with no statements inside. Added null statement ':'.
Add check for homebrew before running brew commands.

Check if home brew is installed then execute the brew commands. Instead of the brew commands just failing.
Initial commit of autohotkey definitions.