Merge pull request #1 from bjornstar/master

v0.0.2: Move to Wizcorp repository.
Merge pull request #2 from bjornstar/master

v0.0.3: Added a getRate method to pull out the rate a growthCurve would be using at a particular iteration.
Merge branch 'master' of github.com:Wizcorp/growth-curve
v0.0.5: remove v0.6 and v0.11 from travis, update readme.