Added external function tf-idf to the main.
 You can use it as a script: python tfidf.py --file corpus.mm
 Or call it as a external function: tfidfCorpus("corpus.mm")
Merge pull request #49 from elenagr/master

Added external function tf-idf to the main.
Merge pull request #50 from ilanfri/master

LSI code added
Finished LDA analysis code
Added gap statistic testing.  Not sure if I've uncommented all the main lines of text that should be there
Merge pull request #51 from emsiepopples/master

Testing for LDA and kmeans code
Correcting a typo
Merge pull request #52 from emsiepopples/master

Correcting a typo
Editted help for min and maxfreq for clarity
Merge pull request #53 from emsiepopples/master

Editted help for min and maxfreq for clarity
Typos corrected in lda_analysis.py
Added unitnorm as an option to create corpus
Merge pull request #54 from elenagr/master

Added unitnorm as an option to create corpus
Added unitnorm as an option to create corpus
Added an option to read the corpus and modify it instead of creating the corpus every time.
Merge pull request #55 from elenagr/master

Option to read an existing corpus from create_corpus.py
Option to compute the optimal number of clusters using the inertia parameter or the statistical gap
Merge pull request #56 from elenagr/master

k-means: Option to compute the optimal number of clusters using the inertia param...
Added nb_kfolds.py and links.py codes
Merge pull request #57 from emsiepopples/master

New code and edits to lda