Major change to extraction algorithm (No API requests)

- Modified V2 Search algorithm to only use term frequency of the
stemmed keywords
- Also changed the algorithm so that the subject terms are weighted
twice as much as the description terms
i.e. multiply the TF of any non-stopword in the subject by 2 to
compensate for it being more important
Merge branch 'updated-search-algorithm'
Use the new V3 Algorithm in app.js

-Replaces the V2 Algorithm with the new V3 algorithm without API
requests.
- Still needs clean up (removing old methods that are no longer in use)