Removed histignore
Fixed the reference to powerline-shell submodule
Fixed hardcoded path to autoenv
Updated README
Fixed formatting
Set terminal's title to current working directory
Removed RVM initialization
Revert "Removed RVM initialization"

Reverts d11bcb3c66cdc7e0bca0ccb80884995ca539d858
Made some paths use Homebrew's prefix
Updated powerline-shell to latest version
Merge remote-tracking branch 'upstream/master'