scaffold topic model python class

[avkoehl]

The class will ultimately use utility functions from custom modules we write. For now it doesn't need to be functional and the nlp and mongo modules can be empty.

Should have methods for:

• constructor that takes as input a list of documents
• running the topic model based on user defined parameters such as K, alpha and beta
• saving model
• parsing the model output
• writing parsed model output to mongodb