Fix image storage enhancement [ER#160: 6bigfire]
Issue littlecodersh#270 (littlecodersh#271)
Make login stoppable in qrCallback [BR#267: githubwing]
Add pushlogin to login without scan qrcode
Fix long contact fetch bug & new protocol of adding friends
Fix contact spelling bug & fix None assignment bug [BR#226: cubesky]
Fix bugs of search_friends and test_connect
Clear useless loggings
Update user warnings
Fix bugs caused by strange contact return values [PR#208: lostdragon]