adding omniture tracking to siginin servlet
Merges omniture tracking into sign in form

Merge remote-tracking branch 'origin/frj-signin-tracking' into signin-form-with-id-api

Conflicts:
	identity/app/controllers/SigninController.scala
	identity/app/idapiclient/IdApi.scala
	identity/test/controllers/SigninControllerTest.scala
	identity/test/idapiclient/IdApiTest.scala