Ignore irssi's away.log

Conflicts:

	.gitignore
Remove duplicate difftool entry for Kaleidoscope
Irssi theme tweaks
Tmux theme tweaks

Looks more like @vilhalmer's config:
https://twitter.com/vilhalmer/status/311529816304267264
Extra linebreaks in vimrc
Set PS1_JOBS
Add configure_vcs_info function to zshrc