Add program init with cmd args

The program can now be started by one of the three following ways :
- main : No arguments, the program will ask the user the universe
settings.
- main <path_to_custom_data_source> : Create the universe with our
custom file "format".
- main <number of dimensions> <number of cluster> <path_to_data_source>
: the same as 'no arguments' but they're specified directly.