remove gitignore
bug fixed in Matern cov
changelog update
remove cov for merge
add cov.py back
added unit tests for SM and Gabor covariance. test_model has corrected demo folder structure. test_inf and test_lik changed proceed to evaluate
Merge pull request #7 from marionmari/chore/newCov-unittests

added unit tests for SM and Gabor covariance.
changelog updated Aug 9th
Merge branch 'master' of github.com:marionmari/pyGPs
Merge branch 'master' of github.com:marionmari/pyGPs into feature/refactor-optimization
removed scale prior as it was really buggy