changed init file of BayesianModel
deleted docs
removed unnecessary imports
created submodule Independencies and moved files
created submodule MarkovModel and moved files
created __init__ file for independecies
created __init__ file for MarkovModel
created docs for BayesianModel and Factor class
changed __init__ file of BayesianModel to remove IMap
modified docstring of Factor
added Independencies module in API Reference
added latex preamble
changed docstring to print the table correctly
modified the symbolic representation of independencies
modified the symbolic representation of independencies