SDC-3320. UI: Update angular version to 1.5.7
SDC-3320. UI: Update angular version to 1.5.7

Change-Id: Ia64bcc5c6edb176684b3ded1ffc00f94154ed0ea
Reviewed-on: https://review.streamsets.net/3328
Reviewed-by: Madhukar Devaraju <d22477479bbf55ba62bd822f4112c80f292c7805@streamsets.com>

studanshu/datacollector,studanshu/datacollector,studanshu/datacollector,studanshu/datacollector,studanshu/datacollector