- add support for passing property sources w/ res:// prefix, resulting
  in a ResourcePropertySource object being added to PropertyManager
> this is a follow-up commit to pull request #217
Merge pull request #221 from kiesel/runners-resources

Add support for configuring ResourcePropertySource sources
Register pull requests #217, #221
- move unittest configuration to src/test/config/unittest
  to comply with Maven standard directory layout
- move test resource files into src/test/resources directory
- add src/test/resources into classpath
- clear hack for test resources in pom.xml
- adapt travis-ci configuration
- implement unittest resource loading through ClassLoaders instead
  of I/O calls on the filesystem
> this is required to support separation of classes and resources
- use ResourceProvider rather than direct I/O in RunnerTest
> one test still broken, though
- use ResourcePropertySources in PropertyManagerTest rather than
  direct I/O
> all tests passing
- make MagicQuotesTest agnostic to where errors are reported:
  STDOUT or STDERR
- make RunnerTest::classPathOption() be independent of actual __FILE__
  settings, instead use reflection to find bundled files.