Use the NSURL class method fileURLWithPath: rather than URLWithString to prevent the app from crashing if there are spaces or special characters in the filename
Add contribution guide
Fixed the indentation
Add link to contribution guide to README.
Merge pull request #596 from moored/master

Fix for crash when double clicking on a .realm file to launch the Realm Browser
Merge branch 'master' into jp-osx-templates

* master:
  Add link to contribution guide to README.
  Fixed the indentation
  Add contribution guide
  Use the NSURL class method fileURLWithPath: rather than URLWithString to prevent the app from crashing if there are spaces or special characters in the filename
added /usr/libexec to PATH to simplify PlistBuddy usage