Cleared the screen before calling `task undo` so multiple undos don't
clutter the screen
Split commands
Added silent modifier to !clear
Added silent modifier to !clear for terminal vim
Merge branch 'master' of github.com:harciga/vim-taskwarrior

Conflicts:
	autoload/taskwarrior/action.vim
Merge pull request #76 from harciga/master

`silent !clear` before `!task undo`