stan-dev/stan — pull request #1140 by randommm (2014-11-19 17:06:15+00:00)
Title: Feature/issue 1129 neg binomial 2 cdfs

#### Summary:
Fix issue #1129. Adds neg_binomial_2 CDFs.

#### Intended Effect:
Adds neg_binomial_2 CDFs.

#### How to Verify:
Check code and pull requests.

#### Side Effects:
None.

#### Documentation:
Included.

#### Reviewer Suggestions:
Anyone.