Some roolbacks

1. The red voice recording icon size and coordinates
2. UsernameTextField size and location (all by code)
3. delete the outlet UsernameTextField in .xib
4. change xib size from iPhone 6 to iPhone 5

Notes:
1. currently only focus on iPhone 5 development
2. need to figure out how to remove xib
3. VoiceRecordViewController should not be in the navigation  view