Added CalendarTool class to help with Calendars testings
small fix to the ProfileAdapter : when the profile kept in preferences doesn't exist anymore, the first profile of the list is selected
added NetworkManager with functions to authenticate, open session and get actual profiles
the authentication is now fully implemented
Preferences.TOKEN has been renamed to Preferences.CREDENTIAL
ProfileAdapter now loads actual profiles
added an id getter to the Profile class
the NetworkManager now have all the functions he needs
improved the ProfileAdapter to work with the updated NetworkManager and Profile classes