Merge branch 'develop' of https://github.com/stan-dev/stan into develop
halfway through manual updates for 2.1
Merge branch 'develop' of https://github.com/stan-dev/stan into feature/issue-324-manual-2.1
Merge branch 'develop' of https://github.com/stan-dev/stan into feature/issue-324-manual-2.1
fixed all errors in manual, but still need to update examples
Merge branch 'develop' of https://github.com/stan-dev/stan into feature/issue-324-manual-2.1
manual building in LaTeX with zero warnings
complete manual fixes for 2.0.1, issue #325
Merge pull request #460 from stan-dev/feature/issue-324-manual-2.1

Fixes #325.
incrementing version number to 2.1.0
adding artifacts (manual + api doc) to the repository for v2.1.0
Merge branch 'release/v2.1.0' of https://github.com/stan-dev/stan into feature/parser_error_reporting