Merge pull request #59 from ilanfri/master

LSI file improved
Changes to the output format
Merge pull request #60 from emsiepopples/master

Changes to the output format
Option to compute the optimal number of clusters using the inertia parameter or the statistical gap
Little bug fixed
Merge pull request #61 from elenagr/master

Little bug fixed
NB code
Merge pull request #62 from emsiepopples/master

NB code
Added file which computes the Bayesian probability of a document being produced from a topic set