Add git ref support to fetch. Not used anywhere yet.
slight workaround to avoid duplication operations during ios installs
Merge branch 'dependencies' of https://git-wip-us.apache.org/repos/asf/cordova-plugman into dependencies

Conflicts:
	src/install.js
	src/util/dependencies.js
Merge branch 'dependencies' of https://git-wip-us.apache.org/repos/asf/cordova-plugman into dependencies