Merge pull request #78 from Livefyre/master

make up-to-date
Merge pull request #79 from escherba/r_update

update lflearn req
Merge pull request #80 from escherba/r_update

reuse hashed n-grams for building of sketches
Merge pull request #81 from Livefyre/master

sync
Merge pull request #13 from escherba/master

sync (2)