Fix integration tests

[TobiX]

These are a collection of changes to make the integration tests more usable:

• Restore (most) ignored test cases by fixing the git and svn dot dirs
• Clearly show skipped tests by using JUnit's Assume
• More robust Subversion detection, so tests also run with SVN 1.9, 1.10 and hopefully any future versions ;)
• Move the last test case from invoker to takeri testing

Finally, I removed the invoker tests. I think having two places with integration tests might confuse (or even discourage) new contributors to the project - If you think this is a mistake, I'll remove the last commit from this branch.