Merge pull request #12 from lei-april/master

fix some memory leaks
Merge pull request #13 from lei-april/master

compress images and cache images in memory
Merge pull request #14 from lei-april/master

present parent’s view as a modal view controller
Merge pull request #15 from lei-april/master

now support choosing an image as a category’s cover
增加播放Gif功能
增加播放Gif功能
Merge branch 'master' of github.com:DaiYue/xiaoyudi_iOS

Conflicts:
	iosapp.xcodeproj/project.pbxproj
	iosapp/utils/HAMGridViewTool.m
improve the category editing view