removing sign compare warning from src/mcmc/hmc/hamiltonians/diag_e_point.hpp
Merge branch 'master' into reduce_warnings
Fixes issue #47. Removing some sign comparison warnings
added: sort and rank functions
Tested version
Added sort and rank to reference manual
Added unit tests
switching between spaces and tabs
Added rev-diff sort versions
Added unit tests for rev-diff sort and some minor changes
Added fwd-diff for sort and its unit tests
Merge branch 'develop' into feature/reduce_warnings
Putting spaces between ) and {
eliminated sign compare warning from stan/agrad/rev/matrix/ldlt.hpp
eliminated sign compare warning from stan/agrad/fwd/matrix/dot_product.hpp
eliminated sign compare warning from stan/agrad/rev/matrix/squared_dist.hpp
eliminated sign compare warning from stan/mcmc/hmc/hamiltonians/dense_e_point.hpp and stan/optimization/bfgs.hpp
eliminated sign compare warning from stan/command/print.cpp stan/mcmc/chains.hpp
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
Merge branch 'develop' into feature/sort

Conflicts:
	src/stan/model/model_header.hpp