Refactor #4125: Apply texture getter/setter in samples
Merge branch 'tests_js_3.0' of https://github.com/cocos2d/cocos2d-js-tests into tests_js_3.0

# By dingpinglv (5) and others
# Via dingpinglv
* 'tests_js_3.0' of https://github.com/cocos2d/cocos2d-js-tests:
  Issue #3427: modify keyboard register codes with new event manager
  issue #3935 Fix some bugs.
  Issue #3427: add an "onExit" function to EventTest
  Issue #3427: modify accelerometer register codes with new event manager
  issue #3935 Fix some bugs.
  issue #3939 frame# -> #
  issue #3945 cc.c4b -> cc.color
  Issue #3427: remove some unused move event handlers
  Issue #3427: modify mouse event register codes with new event manager
Fix tests index CCGame.js path issue
Fix engine path
Issues #3427: Fix some bugs in event system
Merge pull request #337 from pandamicro/tests_js_3.0

Refactor #4125: Apply texture getter/setter in samples and bug fixes