Link to events with "do" instead of "connect"

Removed GribBox widget from the Editor, not userfriendly. It's better…

… to use it directly from code.

Little fix on websocket handshake

2018.11.27

Checking cookie error in websocket handshake.

Resources system and Page structure changes

Now resources can be loaded by nested folders. Resource folders are identified by key.
Page structure changed, allowing access to page events.

Python3.x compatibility issues fixed

Various fixes for python3 compatibility.

Version v0.1.0. Works well but needs more testing.

Consist in a good base of development. Should be tested a lot.