readme spelling correction

These shortcuts do no"t" interfere
Merge pull request #35 from jeremyvaught/patch-1

readme spelling correction
update delimitmate
update vim-session
vim-session is dependent on vim-misc
Remove usetab, it breaks some plugins like vim-godef
Merge remote-tracking branch 'upstream/master' into update

Conflicts:
	README.md
	vim/sessions/default.vim