Added a class for accumulating data into a file.
Deleted librandom and moved the functionality directly to mocasinns into a new namespace Random. At present there are the following files:
* mocasinns/random/boost_random_interface.hpp: Contains class template that provides for a given random number generator of boost the interface that is used in mocasinns
* mocasinns/random/boost_random.hpp: Predefines a few random number generators of boost with the interface
Fixes #6