Merge pull request #144 from harmjanwestra/master

Small updates (and fix towards previously failed merge)
Changes to normalizer:
- covariates are now always orthogonalized
- fix PCA adjustment when correcting for covariates
Allow ImputeToTriTyperConverter to convert specific set of SNPs
Update README.md
Update README.md
Update README.md
Update README.md
Removed unnecessary print
Merge branch 'master' of https://github.com/Bonder-MJ/systemsgenetics
Merge pull request #145 from Bonder-MJ/master

Inclussion of rJava example and small print fix in data reading.
Remove probes with zero variance before normalizing
Merge branch 'master' of https://github.com/molgenis/systemsgenetics.git