basic infrastructure for ode grammar and code gen
Merge branch 'develop' of https://github.com/stan-dev/stan into feature/issue-771-ode-solver
updated so generating code and ode solver, but not compiling yet due to template types
Merge branch 'develop' of https://github.com/stan-dev/stan into feature/issue-771-ode-solver
added empty tests for solve_ode
modified solve_ode to mirror ode_experiment
Merge branch 'develop' into feature/issue-771-ode-solver
Merge branch 'develop' into feature/issue-771-ode-solver
add to_std_vector test
Merge branch 'feature/issue-771-ode-solver' of https://github.com/stan-dev/stan into feature/issue-771-ode-solver
Merge branch 'develop' of https://github.com/stan-dev/stan into feature/issue-771-ode-solver
replaced eigen types with std::vector in solve_ode
Merge branch 'develop' into feature/issue-771-ode-solver
working solve_ode for vars
moved test to correct file and cleaned it up
new test file for solve_ode with harm_osc example
Merge branch 'feature/issue-771-ode-solver' of https://github.com/stan-dev/stan into feature/issue-771-ode-solver
generating functors for each user-defined functions and using for odesystem
started working on more efficient solve_ode
changed step size for solve_ode