fix the bugs: sent null message
              set the title of the viewcontroller.
Implement the function: when select the comment, jump to
SpeakerDetailViewController.
add file .gitignore.
Merge branch 'design'

Conflicts:
	MicroSpeaker/MicroSpeaker/ViewController/MessageViewController.m
修复viewController的title。
修复从PrivateMessageViewController返回时，privateMessgaeTBV和commentMessageTBV显示错乱。
remove some unneed code。
修改方法didSelectRowAtIndexPath