Merge pull request #63 from ufosky/master

Update iOS changelog.
[JENKINS] iOS sdk beta 2014-09-03-04
Update ThreadActivity.java
Update ThreadActivity.java
Release js sdk 0.4.2
Update changelog.txt
[JENKINS] Android sdk version v2.6.4
[JENKINS] iOS sdk version v2.6.4
Merge remote-tracking branch 'upstream/master'
Update iOS changelog.