Changed travis.yml build config, so that build immediately ends if compilation failed.
Merge pull request #2192 from tklein23/abort_travis_if_compilation_fails

Changed travis.yml to not execute tests if compiling failed
Trying to speed-up travis build through "cache: apt"
Merge pull request #2193 from tklein23/enable_cache_apt_in_travis

Trying to speed-up travis build through "cache: apt"
Travis: move back test into script section
refactor install and before_install to later be able to add caching support
for compiling NLOPT, JSON, Eigen
added support for rectified linear neurons
Merge pull request #2194 from khalednasr/develop

added support for rectified linear neurons
added symmetry checks in SGMatrix and modified CCustomKernel to have lhs_equals_rhs set properly
updating revision of data submodule
Merge pull request #2190 from lambday/feature/quadratic_time_mmd

Added proper symmetry check in CustomKernel and updated QuadraticTimeMMD
added kernel matrix sum benchmark - CKernel::kernel calls vs Eigen3::sum
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
Declaring method list_memory_allocs() "static" in header instead of definition.