Bug Fixes
- ios: check cookie availabity before commit (4fc91e4)
- ios: fix a crash caused by thread race (0453be0)
- ios: fix a crash caused by thread race (c092ea5)
- ios: fix border bottom color display error (4425284)
- ios: fix memory leaks (d0dd9ef)
- ios: fix zpoistion error for indicator and header view (90edc45)
- ios: reset properties if value is null (f79214e)