increase group_mask buffer

Signed-off-by: xiehuc <xiehuc@gmail.com>
add detail info for group leave/join

Signed-off-by: xiehuc <xiehuc@gmail.com>
add login validation

Signed-off-by: xiehuc <xiehuc@gmail.com>
add modify group business card

Signed-off-by: xiehuc <xiehuc@gmail.com>
update readme

Signed-off-by: xiehuc <xiehuc@gmail.com>
fix a small memleak
Signed-off-by: xiehuc <xiehuc@gmail.com>

Signed-off-by: xiehuc <xiehuc@gmail.com>
fix sys g msg group_join/leave display

Signed-off-by: xiehuc <xiehuc@gmail.com>
add more info on group join/leave

Signed-off-by: xiehuc <xiehuc@gmail.com>
adjust header

Signed-off-by: xiehuc <xiehuc@gmail.com>
add group add extra info

Signed-off-by: xiehuc <xiehuc@gmail.com>
add buddy add invite message

Signed-off-by: xiehuc <xiehuc@gmail.com>
fix a little memory error

Signed-off-by: xiehuc <xiehuc@gmail.com>
Merge branch 'upstream-preview' into preview