Merge pull request #37 from ufosky/master

Fix UI layout for TutorialAVOSCloud.
Merge pull request #38 from ufosky/master

Add search query demo.
[JENKINS] iOS sdk version v2.5.7
Update changelog.txt
[JENKINS] Android sdk version v2.5.7
Updated ios changelog
Merge pull request #39 from ufosky/master

Add swift demo.