Feat11/add lemmatizer

Merging to master will bring few changes:
* The LDA processing is done now by mallet in ldaMalletProcessor.py. You can get mallet by running the install.sh command from the root directory.
* The final json has the following structure:

```
{ 
    'phi': [ 
                 [ [p0, w0], [p1, w1], ... ], //topic0
                 [ [p0, w0], [p1, w1], ... ], //topic1
                  ... 
           ],
    'theta': {
                     'title0': [ [topicIdx, p], [topicIdx, p], ... ],
                     'title1': [ [topicIdx, p], [topicIdx, p], ... ],
                      ...
             }
    'phrases': [
                        [ [p0, phrase0], [p1, phrase1], ... ]  //phrases for topic 0
                        [ [p0, phrase0], [p1, phrase1], ... ]  //phrases for topic 1
                        ...
               ]
}
```

* The second graph will not work since the data is not included in the json anymore. 
* All the code is pylint compliant.