Merge pull request stan-dev#461 from stan-dev/release/v2.1.0 Release/v2.1.0
tagging v2.0.1
tagging v2.0.0
tagging v1.3.0
tagging version 1.2.0
tagging Stan version 1.1.1
tagging Stan v1.1.0
1.0.3 release
Tagging release v1.0.2
Tagging v1.0.1