Document is_vector_like; update tests

[syclik]

Summary:

stan/math/prim/mat/meta/is_vector_like.hpp needs documentation.

Description:

This returns true: stan::is_vector_like<Eigen::MatrixXd>::value. Add documentation.

Current Version:

v2.9.0

[syclik]

Turns out this isn't a bug -- the function needs doc.

[bob-carpenter]

Agreed. I was confused by this at one point, too.

On Feb 26, 2016, at 4:26 PM, Daniel Lee notifications@github.com wrote:

Turns out this isn't a bug -- the function needs doc.

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