Demo for subset of regressors with larger dataset.
Ignoring autogenerated edition files by matlab.
Merge branch 'subsetOfRegressors' into spaceTimeGP

Conflicts:
	.gitignore: now ignoring all autogenerated files not just .m
Demo space time now learns using subset of regressors for space time GPs.
Errors can be captured when matrix is no longer positive seminidefinite.