add *.xccheckout to gitignore
issues #2834:Use Android standalone toolchain on windows to remove the dependence of cygwin
Merge pull request #3854 from pktangyue/patch3

add *.xccheckout to gitignore
Update AUTHORS [ci skip]
issues #2861:fix memory leak when loading plist file using SpriteFrameCache.
issues #2774:AssetsManager Test downloading progress label not sync with actual download.
Merge pull request #3857 from Dhilan007/develop

issues #2834:Use Android standalone toolchain on windows to remove the d...
modify download addresss in README
Merge pull request #3863 from minggo/change-download-addr

[ci skip]modify download addresss in README
Fix use create_project.py to create project not rename APPNAME at build_native.cmd.
Merge pull request #3865 from Dhilan007/develop

[ci skip]Fix use create_project.py to create project not rename APPNAME at build_...
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into developPerformace