Support accesskey (also on overflow menu), correct outdated comment, fix context menus to allow key activation to activate the "click" event
Provide data argument to context menu, e.g., to allow preferences/locale strings to be passed in
Merge remote-tracking branch 'brettz9/context-menu-accesskey' into 828113

Conflicts:
	lib/sdk/context-menu.js
Bug 828113 - adding tests for context-menu accesskey use
Merge pull request #1618 from erikvold/828113

Bug 828113 - accesskey for context-menu module r=@gozala