Refactor String path -> Path path

[nygrenh]

Instead of strings for paths, we should prefer java.nio.file.Path.

[tieSari]

I could take this.
Sari R

[jamo]

You should be aware of the similar work at testmycode/tmc-netbeans#111

[tieSari]

Ok!
Sari

[ljleppan]

NB: Prefer usage of java.nio instead of java.io.

That is, use Files.exists(Path path)* instead of path.toFile().exists() etc. and preferably replace any existing usage of the class File with Path.

*) http://docs.oracle.com/javase/7/docs/api/java/nio/file/Files.html.