update MessageDisplayKit.podspec v0.2.7

update MessageDisplayKit.podspec v0.2.6

update MessageDisplayKit.podspec v0.2.5

update MessageDisplayKit.podspec v0.2.4

update MessageDisplayKit.podspec v0.2.3

Update MessageDisplayKit.podspec v0.2.2 file

Merge pull request xhzengAIB#119 from yourtion/master

Fix pod error AudioToolbox

Fix the warnings

Fix the block bug.

Update README.md