Tentative of scale update for chart.

- Small problem while changing ticks in charts.js, trying to rollback.
Restructuration of Manager/Streamer for flex.

System now more flexible, separating streaming and counting tweets.
Addition of a global object for shared settings

Settings in the Global object will be loaded from the configuration
on startup.
Addition of cancellable to avoid surprise restart

The streamer should not restart if cancell was called. This could
lead to some weird behavior. Now corrected by storing a cancellable.
Small ratio for better display on graph.

Adding 1.25 the maximum height to the graph to avoid updating it every time.
First step toward printing the tweets: gathering

All tweets are now stored in a temporary list.
Next step short-term:
	1. Display the tweets.
	2. Add a system to scale down the chart if required.