Added aliases for opening TextMate and Git Tower
Aliases 'p' to 'psql' instead of 'powder'
Improved the rbenv aliases
Added an alias for showing the most used shell commands
Added 'gg' for 'git graph' and improved the coloring of the 'git log' alias
Cleaned up aliases a little bit and add 'b' for 'bundle' and 'branches' for 'git branch -a' as well as a few Rails helpers
Checked in iTerm2 configuration