Remove leading underscores from src/stan/mcmc classes and corresponding tests
Fix scope bug
Remove leading and trailing underscores from header guards
issue 782: stan/src/models/misc/gaussian-process/gp-fit.stan will be the same as the model written in the manual
Merge pull request #777 from stan-dev/feature/issue-776-remove-leading-underscore-mcmc

Remove leading underscores from src/stan/mcmc classes and corresponding ...
Merge pull request #780 from stan-dev/feature/issue-578-header-guard-format

Remove leading and trailing underscores from header guards
Merge pull request #783 from stan-dev/feature/issue-782-improvement-to-gp-fit.stan

fix issue 782: improvement to gp-fit.stan
merge develop