Added  .gitignore
[FEAT] Added append and remove functions in implications
[FEAT] Adds fields of views in the state machine

It is a first way to describe which objects are visible to objects declared as
"viewers". These objects are then stored in fov, then in a text file, that is 
given to the client.

TODO : instead of passing by a text file, the changes in fov will soon have to 
be transmitted by callbacks (once the fusion between server and  state 
machine is done).
[FEAT] Imports the web-based part of alftavatn into the project

Now that the project makes use of tornado, all the web-based work is done
in Python and can be merged next to the state machine.
This commit includes Python, Javascript, HTML, CSS and data 
such as .json and .png