Fixing contribution documentation.
Merge branch 'master' of github-halostatue:halostatue/mime-types

* 'master' of github-halostatue:halostatue/mime-types:
  Added two more examples from the README.
  Fix main documentation example so it matches the README.
  According to RFC 4329, section 7.1, text/javascript has the ext .js
  added PSD file extension to the Photoshop type