v8.1.3

Code changes:

• removed the norbloader unit test, which systematically fails (since requires norb dataset to be downloaded)

Release changes:

• Edward Geist has very kindly created a Mac OS X Homebrew formula for this release, DeepCL v8.1.3, which you can find at: https://gist.github.com/GOFAI/53a25ff22f31ec144608

Native library downloads for linux and Windows:

• http://deepcl.hughperkins.com/Downloads/
• usage instructions in the readme, https://github.com/hughperkins/DeepCL