In Window Connexion

* fixed little issue whee hideOrShowBrowser button did not change name accordingly Web Browser visibility ;
+ added a few fixes in onDeActivated method to properly clean up when user leave Connexion Window
+ added a button to leave the Connexion Window and return to home page
In Connexion Window :

+ added error management for :
         # invalid token format (check if none, too small or to big for the moment);
         # check if access token is null after trying to get it;
+ added a success message to be displayed upon successful authentication
+ added a failure message to be displayed upon failed authentication

In API Setuo :
+ added checkAuthStatus to check if the API properly authenticate the user
+ added a two more properties in properties files : user photo count and user id
* changed return type for beginAuth : return false if something went wrong or true if OK
A new try
In API Setup and Connexion :

+ added deep-check of token before sending it to the pay :
	. will check if token key is long enough and not null ;
	. will check if token format is valid (3 digits - 3 digits - 3 digits)
+ added getUserProperties to diminish API calls like getUserID() because API is internet dependant
userProperties are stored in .properties file

In Connexion Window :
* adapted code to change for deep-check token
In Connexion Window :

* moved deep-check token here;
+ added invalid token message to be displayed if deep-check token return false!
+ added a few more operations of cleaning up when user leave window ( onDeactivated() )

In API Setup and Connexion :
* moved out deep-check token as explained hereinabove;
+ added updateUserProperties() to be called whenever properties have been updated and needed to be stored in the userAccountInfo.properties file;
Required commit before a merge
Merge branch 'API_implementation' of https://github.com/batspirit/Imagine into Jules'
Merge branch 'develop' of https://github.com/batspirit/Imagine into Jules'
Some commit issues. Now it's fine.
Merge branch 'API_implementation' into Jules'