Added tests of basic functionality

- Testing using default values for properties
- Testing casting types
- Adding *.js to the test line in package.json to get it working on
Windows
- Removed stupid test
Adding tests
Merge pull request #4 from saibotsivad/add-tests

Adding tests, awwww yeah.
Merge branch 'master' of https://github.com/ArtskydJ/text-metadata-parser