restored /external/lua/ in .gitignore
added external files
added template
added bin and others
added framework and samples
modified setup_mac.sh
added bin/*.*
modified ProjectCreator
modified ProjectCreator:  cocos files copy ok
modified ProjectCreator: framework files copy ok;  proj.ios_mac run ok
added Welcome
Merge branch 'v3' of github.com:htlxyz/cocos2d-x into v3