Let's try vim-plug

I really love shougo's work, but I find it a bit verbose, I like how
simple junegunn's plugin was.

And also this gif swayed me:
![](https://raw.githubusercontent.com/junegunn/i/master/vim-plug/40-in-4.gif)
Add rainbow parentheses
Update names of file endings, fix a broken repo
disable jump to tag in phpcomplete
Use vim sensible
restore trailing ws fix
fix vimproc for unite
Merge branch 'sensible'

Conflicts:
	.vimrc