Added recommender class and project builder class
Merge branch 'master' of https://github.com/suvodeep-pyne/gitbook
Merge branch 'master' of https://github.com/suvodeep-pyne/gitbook
Merge branch 'master' of https://github.com/suvodeep-pyne/gitbook
Modified recommender
Merge branch 'master' of https://github.com/suvodeep-pyne/gitbook