Add function to search in zsh history
Remove unused setting related to tmuxstart
Speficy the zsh path so we don't use the OS X one
Pipe copied text to system clipboard

Use copy-pipe to pipe the copied text to the system clipboard, as well
as to the tmux paste buffer.

More information:
http://robots.thoughtbot.com/tmux-copy-paste-on-os-x-a-better-future
Set locale to Norwegian on OS X, otherwise to US English