Merge pull request #57 from zhanw/sdk3.0

support @ message

Merge branch 'dev' of github.com:easemob/easeui into dev

# By zhaoliang
# Via zhaoliang
* 'dev' of github.com:easemob/easeui:
  add error prompt when in blacklist.

Merge pull request #54 from greenmemo/initial_letter

fix initial letter bug

Merge pull request #43 from greenmemo/B237

B237 thumbnail issue

remove a time-consuming log

Merge pull request #39 from greenmemo/B222

null ptr protected when refresh MessageList

2.2.5 release

Merge pull request #28 from greenmemo/down_img_account_kicked

downloading image account got kicked

Merge pull request #27 from greenmemo/fix_mig_thumb_show

migrate: fix thumbnail show issue

Merge pull request #26 from greenmemo/h_cmi

H cmi