fix test name and use junit 4
pom stuff
wrote some classes with categories
wrote some classes with categories
wrote some classes with categories
wrote some classes with categories
wrote some classes with categories
wrote some classes with categories
wrote some classes with categories
wrote some classes with categories
Merge pull request #1 from cheere/master

Created some test classes and a POM profile.
Currently three ways of grouping tests (during mvn test phase) are implemented:
 - a Maven profiles which directly lists/names tests via patterns. run this with -PrunGreenTest
 - test suites, run with -Dtest=RedTestSuite or -Dtest=StandardTestSuite
 - some of the test suites are defined via categories
 - should be possible to use categories directly via -Dgroups=de.is24.playground.RedCat (or with .java?)