Merge pull request #11295 from fcampo/FB_resolution_images

Bug 900361 - Enable customization per target device of resolution for FB images (r=jmcf)(cherry picked from commit 4b347e4e39b1716b68463dccc63c1b3eb49158b3)

Conflicts:
	apps/communications/contacts/js/import_utils.js
	apps/communications/contacts/test/unit/link_test.js
	apps/communications/facebook/test/unit/facebook_connector_test.js
	apps/communications/import/test/unit/import_test.js