add right click menus pushing options for devices
no right click init if options is not set;

Restart chrome to effect
Merge branch 'master' of https://github.com/goodbest/pushover-for-chrome into goodbest-master

Conflicts:
	options.js
Merge branch 'goodbest-master'
after successfully saving your user key + api token, contextMenu is
reloaded on the fly