Calculation of the list in a proper manner

Now need to generate JSON
Counts per keywords -> JSON, refactoring

- Refactoring toward having a separate implementation of stores.
- Creation of the JSON for historical data. Little problem of character
escaping to solve.
Working historical display

All in title.
Addition custom CSS for display.

All the display is now ready. The backend needs to be restructured a bit,
some comments need to be added. A next step will be to add a recuperation system,
restarting the research if the server goes down.
Stores for PostgreSQL finilazed.

Now need to change the name of Evolution and of the Database
Evolution for postgresql not in default, ref.

- Evolution for refactoring is not anymore in default
- Addition of a couple of tests for Memory storage (very similar to the one
for postregsql)
- Coding of the memory storage
- Removal of uneeded routes
Addition of Representer.

Controllers are now totally stateless. Akka calls are made easier via
implicits. Representer (i.e. UI-specific functions are stored in specific
package, representers). The controllers really just do datamappings.