Added angular ~1.4.1 preference rule to bower config.
Added angular ~1.4.1 preference rule to bower config.

GoogleCloudPlatform/PerfKitExplorer,dq922/PerfKitExplorer,GoogleCloudPlatform/PerfKitExplorer,GoogleCloudPlatform/PerfKitExplorer,GoogleCloudPlatform/PerfKitExplorer,dq922/PerfKitExplorer,dq922/PerfKitExplorer,dq922/PerfKitExplorer