Ignore unnamed objects

@see https://groups.google.com/forum/#!topic/melonjs/GUpSR7uX2lk
[#250] add the new `me.save` class and moved `me.stat` to the plugin repository
[#250] added score & hi-score management as test case for the new `me.save` class
[#250] renamed `init` to `add`, and added a (not very well working) `delete` function

as a bonus, fixed a couple of lint errors :P
[#250] fixed the `me.save.delete` function

Also removed some previously forgotten debug code from entities.js
[#283] fixed issues when switching state (double call to `destroy`) and removing objects (exception)
Switched to the default boilerplate template for the plateformer example
updated CHANGELOG
fixed a bunch of typeof mistakes
fixed the device orientation detection (yes, another typeof mistake) and added the value in the devicetest example
[#250] various fixes and improvements to `me.save`

- fixed localStorage detection by catching the exception thrown if
cookies are blocked
- don't call localStorage functions if feature is not supported or not
allowed (e.g. cookies blocked)
- fixed localStorage content being loaded before the actual feature
detection.
- fixed documentation
Make sure offset is not instantiated each time the constructor is called (when using entity pooling)

I actually wanted to replace `offset` by `pos` as discussed, but the
current 'hybrid' implementation and most of all the following line
makes it impossible for now :
https://github.com/melonjs/melonJS/commit/f4974f3ab0e9d242b8ca97e87e5a6d
533418f66d#diff-1089c7ebe64469651baf69f6982fa3deR646
fixed Opera Mobile detection when sniffing user agent

@see
https://developer.mozilla.org/en-US/docs/Browser_detection_using_the_use
r_agent
updated CHANGELOG
Documentation: Document gameScreen[XY] and gameWorld[XY]
removed the waffle badge as it was causing errror in the generated documentation
[#284] fixed me.ImageLayer drawing being delayed by one frame

this now relies on the minpusub messaging system to inform the
imageLayer the viewport has changed :P
[#284] removed the useless `isDirty` flag

note that this does not fix the viewport triggering a viewport change
event at each frame
[#284] fixed the camera triggering a viewport change event at each frame

this is more a workaround, and the `_followX` function certainely need
a better update ...
README.md: Convert tabs to spaces