Add Carbon submodule
Add Carbon to the list of includes
bzion-load.php: Also load classes from other namespaces
Utilise Carbon in the Group class
Merge branch 'master' into carbon
Merge branch 'master' into carbon

Conflicts:
	.gitmodules
Create a Date class which extends Carbon
This lets us eliminate the need of adding a "use Carbon\Carbon" statement on every file where it is utilised
and also allows the creation of additional functions that may be needed.
Rename Date class into TimeDate
Merge branch 'carbon' from kongr45gpen/bzion