Implemented new private context with privileged _setContext()/_getContext() and public getContext()/setContext();
Deprecated update(), getDataUrl(), getData(), setData(), unShadow(), this.data, this.context, options.data_url;
substitute() is now just an alias of new uijet.utils as format();
Deprecated filter() in data/backbone module;
Deprecated refresh argument for fetchTemplate()
Improved wording, fixed some typos
Removed uijet.register from Concepts