Make project Eclipse friendly out of the box

The issue is that maven-eclipse-plugin generates the .project file based on the artifact name in the pom, but the folder where this is contained doesn't match. There may be a way of fixing this in the maven-eclipse-plugin configuration but from experience the least you deviate from the prescribed path in Maven the less headaches you'll have.

I also added .metadata to .gitignore so it won't get in the way.