WP8 v3.3 bug fixes

This pull requests fixes the following WP8 issues

1. Need to reset the accelerometer on WP8 before trying to access it again. Fixes issue https://github.com/MSOpenTech/cocos2d-x/issues/77
2. Fixed incorrect filename in ExtensionsTest/CocoStudioComponentsTest/SceneController.cpp. Fixes issue https://github.com/MSOpenTech/cocos2d-x/issues/75
3. use CCGLViewImpl.h in WP8 cpp template