Tweak NUTS acceptance statistic, introduce number of divergent iterations for diagnosing adaptive HMC implementations
Merge branch 'develop' into feature/improve_nuts_diagnostic

Conflicts:
	src/stan/mcmc/hmc/nuts/base_nuts.hpp
Update sampler param name to be consistent with doc
Update sampler param name to be consistent with doc
Update model tests to ignore new diagnostic
Merge pull request #388 from stan-dev/feature/issue-323-size-decl-types

Fixes #323.
Merge branch 'hotfix/v2.0.2' of https://github.com/stan-dev/stan into hotfix/v2.0.2
Remove last reference to n_divergence
Fix header guard for mock_hmc.hpp
analytic gradients for sd, variance, new vari impl for stored gradients, plus tests, doc
Merge branch 'develop' of https://github.com/stan-dev/stan into feature/parser_error_reporting
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
getting test-headers to pass
just expanded test grammar to validate that issue #367 is already fixed on hotfix/v2.0.2
Merge branch 'develop' into bugfix/issue-379-sd-grad-at-0

Conflicts:
	src/stan/agrad/matrix.hpp
removed compiler warnings
Merge pull request #412 from stan-dev/bugfix/issue-367-local-var-index-decl

Fixes #367.
Merge pull request #411 from stan-dev/bugfix/issue-379-sd-grad-at-0

fixes #379.
Merge pull request #414 from stan-dev/bugfix/issue-379-sd-grad-at-0

fixes #379.
Merge pull request #415 from stan-dev/bugfix/issue-367-local-var-index-decl

Fixes #367.