Added --precise flag to getStatistics.R script to increase precision of statistics.

We need this for the MiSeq... Ask Eddy de Boer (or Lennart or me) for more details.
Merge branch 'master' of https://github.com/molgenis/molgenis-pipelines
Added readme
Merge pull request #166 from mdijkstra/master

improved getStatistics script + added readme