fix(karmaconfig): fixes proper vendor files includement

We had the problem that grunt:karmaconfig was configured with hardcoded vendor files.
These vendor files are needed in tests, but also need in later build process.

In addition, custom configured vendor files weren't even included in
karma configuration.

This commit pulls all custom vendor files out and only hard codes needed
vendor files.
Merge pull request #28 from neoskop/vendor-files-fix

fix(karmaconfig): fixes proper vendor files includement