Use Cython for gaussian kernel
Add cythonize to setup.py
rename src --> gp
Update __init__s
Includ numpy headers
Add periodic cython code
Update .gitignore
Add cython target to Makefile
Update .travis.yml to use miniconda and not install llvm
Remove numba from requirements
Go back to using memoprop
Remove static methods from base kernel class
Use double, not float!
Fix imports and better test reporting
Fix kernel tests
More efficient gaussian kernel computations
Be typesafe
Test for dtype in test_gp.py
Add linalg cython file for np.longdouble dtype
Small performance tweaks to gaussian_c.pyx