Fixed issue #36
Fixed issue #36 again :)
Nicer printing of texture loading

This will probably not make it to the latest version, but at least for
debugging purpose it might be useful. And it's shiny. And that's one way
to force myself to read the code.
Now able to modify zoom (Keys : A/Z)
Merge branch 'interface_dev' of https://github.com/GL-MPRI-2014/GL_MPRI_2014 into interface_dev
Fixed interpolator behaviour
Improved execution flow readability, see #40

Texture are not loaded magically before the execution of the main
function, and the order of the calls seems more logic.
#40
First implementation of the UIManager
Merge branch 'master' into interface_dev
Menu now closes properly
First test on state machine (not working)
A few opens for doc to work
Removed dummy_map
Now working state machine and game (though ugly)
Merge branch 'interface_dev' into state_machine
Cleaned main
Merge branch 'master' into state_machine
First iteration of a MainMenu
Updated to match new MainMenu