Big work on the documentation. Some fixes too, and some additions.

Documentation:

- added a global roadmap to priorize items to be done for the project
- introduced some links (relative) between documentation files: might be broken! (didn't test yet if they were properly written)
- Eclipse Plugin
	- removed done items for Outline
	- added documentation to help aligning the plugin with latest changes of the backend regarding the communication protocol
	- completed the documentation about what has to be done to make highlighting work properly
	- completed the documentation about what has to be done to synchronize document changes between the plugin and the backend
- global minor updates/improvements

Graph visualizer:

- little fix for the display of the number of nodes in the tree

Package definition:

- updated the urls of the repo: official Aria Templates instead of my own fork
- changed some properties about installation/deployment

Editor/Mode manager:

- fixed the 'exec' method, not accepting something else than the propery 'svc' for the service specification
- improved the error management of the 'exec' method
- improved error management of several methods (for null inputs essentially)
- added the 'configuration' method, to get the general configuration of an editor (mode agnostic)
- added a class to handle document IDs

DOP:

- now the 'applyProperties' method is able to handle free properties of input spec objects and to copy them (without duplicating standard properties that would have been passed with aliases)
- this introduced a new feature which is: an optional object can be passed to several methods to gather information about what has been done, how the spec object has been processed, which computations occurred, etc.

OOP:

- added common property names to be used to defined the parent class (extends, extend)
- used the Object.create native function where possible, for a better quality of the code

Code:

- added some documentation about the class

New classes:

- Error: to have a wrapper around native Error, to be used for exceptions

STD:

- converted the server index file from LiveScript to JavaScript

JS Mode:

- removed the old sessions management code