Use of a single emscripten HTML template file.
Fixes some warnings

... and updates the version to pre-alpha0
Merge pull request #3245 from ricardoquesada/fixes_warnings

Fixes some warnings
Merge pull request #3243 from azmeuk/emscripten-package

Use of a single emscripten HTML template file
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into iss2404-ext-deprecated

Conflicts:
	AUTHORS