closed #3991, Add method to reload cached texture & update the nodes used the texture.
Modify methods of Changing color and opacity.
Fixed bug of loadingbar
fixed #3868. Add guard check to send method of HttpClient
Add custom widget and reader
Merge branch 'develop' into develop_nutty_modify_framework_for315
Fixed crash of sample
Modify trigger
Merge branch 'develop' into develop_nutty_modify_framework_for315
Merge branch 'develop' into develop_nutty_modify_framework_for315

Conflicts:
	build/cocos2d_libs.xcodeproj/project.pbxproj
	cocos/gui/UIButton.cpp
	cocos/gui/UIButton.h
	cocos/gui/UIWidget.h
Modify project file
Merge branch 'develop' into develop_nutty_modify_framework_for315
Fixed build error except Windows
Merge branch 'develop' into develop_nutty_modify_framework_for315
Modify windows project
Add RichText
Merge branch 'develop' into develop_nutty_modify_framework_for315
Merge branch 'develop' into develop_nutty_modify_framework_for315
Fixed bugs of Flipping
Merge branch 'develop' into develop_nutty_modify_framework_for315