allow glm functions to accept var matrix types

[SteveBronder]

Summary

Updates the glm functions and their tests to use var<Matrix> types. This also has a small bugfix for assigning row vectors to var<Vector> types. 99% of the PR here is actually just updating the glm tests to use TYPED_TESTS() for checking both normal matrices and var matrices.

Tests

The glm tests have all been modified to be a TYPED_TEST_SUITE() with each test using TYPED_TEST() instead of just TEST() so that it will check if the functions work for both Eigen::Matrix<var> and var_value<Eigen::Matrix<double>> types.

Side Effects

Nope

Release notes

Have glm functions work for the new matrix type

Checklist

• Math issue How to add static matrix? #1805

• Copyright holder: Steve Bronder

  The copyright holder is typically you or your assignee, such as a university or company. By submitting this pull request, the copyright holder is agreeing to the license the submitted work under the following licenses:
  - Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)
  - Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

• the basic tests are passing

  • unit tests pass (to run, use: ./runTests.py test/unit)
  • header checks pass, (make test-headers)
  • dependencies checks pass, (make test-math-dependencies)
  • docs build, (make doxygen)
  • code passes the built in C++ standards checks (make cpplint)

• the code is written in idiomatic C++ and changes are documented in the doxygen

• the new changes are tested

[stan-buildbot]

---

Name	Old Result	New Result	Ratio	Performance change( 1 - new / old )
gp_pois_regr/gp_pois_regr.stan	3.57	3.5	1.02	1.82% faster
low_dim_corr_gauss/low_dim_corr_gauss.stan	0.02	0.02	0.96	-4.65% slower
eight_schools/eight_schools.stan	0.09	0.09	1.07	6.22% faster
gp_regr/gp_regr.stan	0.15	0.15	1.04	3.9% faster
irt_2pl/irt_2pl.stan	5.68	5.74	0.99	-1.0% slower
performance.compilation	93.21	91.16	1.02	2.2% faster
low_dim_gauss_mix_collapse/low_dim_gauss_mix_collapse.stan	8.64	8.08	1.07	6.46% faster
pkpd/one_comp_mm_elim_abs.stan	31.38	32.53	0.96	-3.67% slower
sir/sir.stan	123.14	123.96	0.99	-0.67% slower
gp_regr/gen_gp_data.stan	0.03	0.03	1.0	0.48% faster
low_dim_gauss_mix/low_dim_gauss_mix.stan	3.03	3.0	1.01	1.2% faster
pkpd/sim_one_comp_mm_elim_abs.stan	0.39	0.42	0.95	-5.39% slower
arK/arK.stan	2.07	2.03	1.02	1.79% faster
arma/arma.stan	0.28	0.28	1.01	0.62% faster
garch/garch.stan	0.62	0.61	1.03	2.68% faster
Mean result: 1.00922372923

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Jenkins Console Log
Blue Ocean
Commit hash: 1d82931

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Machine information

ProductName: Mac OS X ProductVersion: 10.11.6 BuildVersion: 15G22010

CPU:
Intel(R) Xeon(R) CPU E5-1680 v2 @ 3.00GHz

G++:
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin15.6.0
Thread model: posix

Clang:
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin15.6.0
Thread model: posix