Implemented addScale, added distance similarity calculate, need to fix damping
adding distance similarity and addScaled
Modifying the distance
Remove unused imports
Change to assertThat
update imports
Update environment variables for Travis build
Merge pull request #381 from heyilin/master

Adding addScaled and creating new distance similarity
Pre-scan histories for predicates before filtering

(cherry picked from commit cbe8810)
Update release notes for #387

(cherry picked from commit 175e498)