Merge branch 'develop' of https://github.com/stan-dev/stan into develop
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
fixes issue #323 -- allowing local variables in array and matrix size declarations
added doc for change in size declarations
Merge branch 'develop' of https://github.com/stan-dev/stan into feature/issue-323-size-decl-types
Merge pull request #388 from stan-dev/feature/issue-323-size-decl-types

Fixes #323.