fixed #2259:add description of path that custom font can put in
Merge pull request #2865 from minggo/master

add description of path that custom font can put in
call CCScriptEngineManager::purgeSharedManager()
Revert "call CCScriptEngineManager::purgeSharedManager()"

This reverts commit cb14a8c82d65b5281481997ce10fb84705215557.
Merge branch 'gles20' of https://github.com/growingdever/cocos2d-x into gles20