Fixes in new DoubleMatrixDataset

Casting fixes
Changed output of normalizer during PCA step.
Updated pom

Now there is no need anymore for installing local jars.
Added a readme.md for the eQTL mapping software
Removed install-local-jars and changed main README.md
Merge pull request #64 from Bonder-MJ/master

Updates in new Matrix, additions in PCA output, updated pom and changes in Readme's
Merge branch 'master' of github.com:molgenis/systemsgenetics