[Done] Bugs: Some functions not support iOS4.3

Description: Some functions not support iOS4.3, only iOS5.

Priority: High

Status: Fixed and released by V1.6.

[Fixed] BUG: Crash in add/del Groups

Description: When enter add/del groups, the app is crashed all the time.

Priority: High

Status: Fixed by v1.1

Root Cause: If the firstname or lastname is empty, the app frees the nil pointer.