Merge pull request #264 from LI-HE/master

IOS 6 debug #2
Merge pull request #28 from ChrisBoesch/master

update
Merge pull request #265 from LI-HE/master

IOS debug #3
Merge pull request #266 from LI-HE/master

IOS video play bug solved
Merge pull request #267 from ruijunhuang2010/master

Merge pull request #28 from ChrisBoesch/master
Merge pull request #29 from ChrisBoesch/master

update
Merge pull request #268 from LI-HE/master

Solved the practice tab not displaying issue
Merge pull request #269 from ruijunhuang2010/master

Merge pull request #29 from ChrisBoesch/master
Merge pull request #30 from ChrisBoesch/master

update
change update player location
Merge pull request #270 from ruijunhuang2010/master

update
Merge pull request #31 from ChrisBoesch/master

Merge pull request #270 from ruijunhuang2010/master
minor change
Merge pull request #271 from ruijunhuang2010/master

update
Merge pull request #12 from ChrisBoesch/master

update