worked on optimizing recommendation algorithm
1) wrote sql code to test times of sql vs ruby code
2) refactored Score module for better performance
3) adjusted R value to 0.5 which pushed performance from 3 minutes for recommendations to 19 seconds
updated readme
updated readme
Merge pull request #27 from vikram7/vr-convert-rec-algos-to-sql

Vr convert rec algos to sql