Fix more memory bug.

1、XHMessageTextView the - (void)insertText:(NSString *)text  method
memory leak, delete the method fix it bug.
2、UIImage+XHRounded CGImageRef imageMasked =
CGBitmapContextCreateImage(context); the row must be release
CGImageReg, fix it bug for CGImageRelease(imageMasked);

fix https://github.com/xhzengAIB/MessageDisplayKit/issues/16
Add comments and fix Gesture Control keyboard

fix https://github.com/xhzengAIB/MessageDisplayKit/issues/17

fix https://github.com/xhzengAIB/MessageDisplayKit/issues/18
Voice playing animation.

fix https://github.com/xhzengAIB/MessageDisplayKit/issues/19
Updata MessageDisplayKit.podspec v0.1.1
Add Framework due with messageDisplayKit
Fix more bug and add workspace more projects

fix https://github.com/xhzengAIB/MessageDisplayKit/issues/23

fix https://github.com/xhzengAIB/MessageDisplayKit/issues/22

fix https://github.com/xhzengAIB/MessageDisplayKit/issues/21

fix https://github.com/xhzengAIB/MessageDisplayKit/issues/20
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Refactor XHMessageTableViewController delegate.

fix https://github.com/xhzengAIB/MessageDisplayKit/issues/24
delete files.
delete files.
Merge pull request #4 from xhzengAIB/master

Update codes