Updates the color file extensions from .xml to .icls

It happend after running it in Rubymine 5.4.2, though this was a fresh
install and could have happened in an earlier build.
Adds Meta-Shft-o (or Cmd-O) quick open file

As this seems to be Mac default (xcode and AppCode), not to mention the
rubymine default.  This required unbinding it from Open Directory which
I think happens rarely enough that I think it was worth it.