typo corrected

Merge branch 'master' of https://github.com/simecek/HPQTL

Conflicts:
	README.md
Merge branch 'master' of https://github.com/simecek/HPQTL

Conflicts:
	README.md
Merge branch 'master' of https://github.com/simecek/HPQTL
several bugs corrected, now working with 3-dim genotype probs object
half.inv and variance.decomposition functions now separated from scan1