[sublime] [v4] Added sublime bindings for select_lines and fixed duplicateLines

I have added the key binding for Shift+Alt+Up and Shift+Alt+Down shortcuts.

I've also fixed the key binding for Shift+Ctrl+D, which was duplicating lines at each cursor, when it was supposed to do it only if it was not a selection. If it was a selection, it should duplicate the selection content, which is now fixed.

I would also like to notify that I'm interested in working with your organization, for GSoC 2014. I replied to you in the forum for GSoC in Google Groups, hope you saw that.