Merge pull request #2 from DrDub/master

Implemented sparse observations and configurable additive smoothing.
added missing jasmine-node dev dependency
added some basic coverage for additive smoothing and sparse observations
classifications does not sort
Merge pull request #3 from hassalmx/master

classifications does not sort
0.0.8
jshint issues + gitignore
updated engine to latest node
reverted prev
updated package.json with test script
readme updated with link
Merge pull request #4 from alexanderbeletsky/master

JSHint fixes + few minor things