Merge pull request #2196 from lambday/feature/quadratic_time_mmd

added kernel matrix sum benchmark - CKernel::kernel calls vs Eigen3::sum
Tell curl to follow permanent redirects.
Merge pull request #2197 from tklein23/fix_curl_redirect

Tell curl to follow permanent redirects
Use proper notation for Gaussian CDF.
Replace * by \cdot since * is used for convolution.
Merge pull request #2198 from wittawatj/develop

test commit
Merge pull request #2200 from wittawatj/docfixes

doc update
added sum methods for CCustomKernel