[#378] Fixed renderable position when using polygon shape in Tiled
removed duplicated properties (those are defined in `me.Renderables`)
[#157] cleaned the audio detection code from `audio.js` and added a more simple version into me.device
[#157] use the global Howler mute/unmute function when (un)muting all sounds
[jshint] defined `Howler` as a custom global variable
[jshint] fixed variable definition
[#157] replaced `settings.volume` by the the corresponding Howler global volume setting
[#157] fixed sound unload
Added a few missing keyCode to the input key list
[#157] added keyboard shortcuts to the platformer example allowing to adjust global volume

(test case)
[#315] updated the fullscreen support to reflect last API changes
[#315] added a keyboard shortcut in the platformer example to toggle fullscreen on/off

makes it easy to test support on all browsers :)
[#315] fixed the `exitFullscreen` function

this is working quite well actually :)
[examples] map the UP key to jump as well
[#315] more fixes to the me.device fullscreen API (now working with Safari)

it appears that fullscreen cannot be simply requested on
`document.body` but on the canvas element itself
[#315] Updated documentation, added a better small example
[#315} documentation
minor fix in the html tags
removed usage of sound enable
added callbacks association with the howler sound id