WIP : Modification of all methods and classes to follow this BoUML
diagram http://i.imgur.com/dJZBU4H.png

**Switch of the Continent class name to Empire to reflect more what the
class is supposed to represent.
**Added class controller that is a parent class of player to allow
installation of whether: ai or even network controlled players
**Given detail of several toString methods (empire&region)
**Complete modification of the Tray constructor by adding the Regions
contained in Empire in a Region array for exemple
**Added details on the standard game course on main class
**Planned modification of the entire program through a series of update
to get it work as intended in the BoUML diagram
**Complete modification of the Dice class by removing the instances,
getting it to work as a superclass of two overloaded methods.
**Deletion of the whole armies package as the armies values will be
included in Region in the future

And more.