Marks addition, inspired by jeroenjanssens.com

http://jeroenjanssens.com/2013/08/16/quickly-navigate-your-filesystem-from-the-command-line.html
Fixed unfortunate alias
Much more reliable completions
Better mark printing function
Tab align mark list
A more civilised printf ;)
Merge remote-tracking branch 'origin/marks'

Conflicts:
	zshrc