added binding on control-space; changed order to order by
merged from amjith; resolved conflict
added LEFT, RIGHT, OUTER keywords
removed unnecessary keybinding in selection mode
Merge branch 'master' of github.com:j-bennet/pgcli
Merge remote-tracking branch 'upstream/master'
Merge pull request #3 from j-bennet/master

Added key binding on control-space; changed order to order by