adding bounds tests for dirichlet; currently fails
dirichlet: adding test for mismatched sizes
dirichlet: checking mismatched sizes
dirichlet: checking for alpha > 0
dirichlet: checking theta is a simplex
dirichlet: adding bounds tests for vars
Merge pull request #254 from stan-dev/feature/issue-247

Fixes #247.
fixed #264. fixed 'build' target in makefile
updating makefile doc
quoting the path separators
adding indicator that Stan tools were built
Merge pull request #265 from stan-dev/feature/issue-264-makefile-build-target

Fixes #264.
Merge branch 'develop' of https://github.com/stan-dev/stan into feature/parser_error_reporting