Merge pull request #10 from sshimko/master

Load mtgox json response for non Gzip-encoded response types.
Fix mt gox toggle state.

By setting it to true, even if the mt gox display was disabled
via the command-line, it still displayed the ticker, and never
became false, so mt gox always appeared with a value that never
changed (0.0).
Add OS X install guide
Add more OS X info.