Added .ackrc file from https://github.com/paulirish/dotfiles

Added/Removed aliases from .aliases

Changed reference of LS_COLORS (Unix) to LSCOLORS (OSX)

Included z script from https://github.com/rupa/z

Included git commands from https://github.com/jamiew/git-friendly

Reintroduced init folder from https://github.com/mathiasbynens/dotfiles