Fixes #41 (Fix error message when execute `pry -f`)
Closes #30 (Colours of Ruby 1.9 Symbols are off) You have to invoke `PryTheme::Config.paint_key_as_symbol!` inside your '.pryrc'.
The tests were failing, and this change fixes them.
Fixes #39 (Unable to load Pry) There probably should be some tests, but I'm too lazy to figure out how to write them properly.
Now I'm sure that Pry Theme works on some previous versions of Rubinius.
The key thing is this commit is that we depend on CodeRay v1.1.0 and higher. The awesome_print users were unhappy, because it was relying on the older CodeRay, while Pry Theme needs a newer version. This results in a conflict. Setting stricter deps should help.