harmonize names with molgenis-app-lifelines (reduces shadowing errors)
resolve findbugs warnings
cleanup database, remove functionality that does not work with hibernate4
remove old jdbc code, rename JPAQueryGeneratorUtil to JpaQueryGeneratorUtil
remove unused class
Merge pull request #400 from dennishendriksen/master

Cleanup database interface + other stuff
Update of README.md
Merge pull request #401 from joerivandervelde/master

Update of README.md