First drop of stuff to clean temporary files.
Fix a couple of teething issues. Seems to be working now.

- Move 'cleanTemp' out of 'withUnionMount'
- Chown on files (was only doing dirs and symlinks)

So far, no problems encountered!
Change formatting.
Rename 'CleanTemp' to 'CleanMethod'.

Also add a tag that this should resolve issue #1.
Merge pull request #3 from wtsi-hgi/issues/cleanTemp

Issues/clean temp