added ipynb showing that optimizing in h2-space is fine when kernels have been scaled to sum(diag(K))=N
added ipynb showing that optimizing in h2-space is fine when kernels have
been scaled to sum(diag(K))=N

MicrosoftGenomics/FaST-LMM,MicrosoftGenomics/FaST-LMM,zhonghualiu/FaST-LMM,MicrosoftGenomics/FaST-LMM,zhonghualiu/FaST-LMM,zhonghualiu/FaST-LMM