v0.4

A new way to create model states.
Now, to create a MC state with the two following transitions:

• To state 1, observing 'a', with probability 0.6
• To state 1, observing 'b', with probability 0.4

it's
MC_state([(1,'a',0.6),(1,'b',0.4)],0)
instead of
MC_state([0.6,0.4],[1,1],['a','b'],0)
0 being this state ID