add ssh completion for "Host" field
add new powerline version for "box" host
Merge branch 'master' of https://github.com/netzverweigerer/oh-my-zsh

Conflicts:
	themes/powerline.zsh-theme
new gitignore
change colour of prompt segment
add new weakline theme (modification of the powerline theme, without arrow characters)
add new zshrc file, containing workaround for xfce4-terminal
Merge branch 'master' of https://github.com/netzverweigerer/oh-my-zsh