Merge branch 'develop' of https://github.com/stan-dev/stan into develop
changed truncated models to use cdf, ccdf, log-diff-exp, added tests in parser to validate univariate, updated doc with new translations
Merge branch 'develop' of https://github.com/stan-dev/stan into feature/truncation-logcdf
Merge pull request #177 from stan-dev/feature/truncation-logcdf

Feature/truncation logcdf