Confirm stemmer algorithm is working

- left instructions in lexer.js to explain how to implement
Get the union of subject and description terms to avoid duplicates

-Also removed %20 as the delimiter because the ' ' (space character)
gets the same results and looks cleaner
Add comments to indicate source of stemmer algorithm
Add http & https to the stopwrod list

-also adjusted stop word comwww to be com,www
Add word stemming to pseudo phrase algorithm

TF and IDF are now calculated on stemmed non-stopwords
Merge branch 'stemmer'
remove console.log tests for stemming