photoview add zoom support.
？？ 添加zoom效果。 commit rejected？？
Merge branch 'master' of git@github.com:albaniliu/chuangxindemo.git

Conflicts:
	AndroidManifest.xml
	src/com/albaniliu/chuangxindemo/ImageShow.java
	src/com/albaniliu/chuangxindemo/widget/LargePicGallery.java