Stop sorting config keys for newer ruby versions.

[gizmoguy]

• For ruby versions > 1.9.3 use order specified by user for
  configuration, otherwise sort it alphabetically.
• Remove extraneous whitespace.

[gizmoguy]

Sorry submitting on a different PR to #12 but I messed up my rebase.

I've performed the changes asked for and added a bunch of tests because I didn't have any machines to test on with older ruby versions.

I'll also look into fixing the lint issues picked up by rubocop.

[edestecd]

Other then the rubocop errors, it looks good to me.

[gizmoguy]

Fixed most of them.

What do we think about "Style/RegexpLiteral: Use %r around regular expression.".

Usually I prefer using slashes as the regexp delimiter?

[edestecd]

I always go with the community recommendation. Unless you have a really good reason not to.

[edestecd]

Its much cleaner if you don't have to use the escapes. Escapes make it harder to read.

[gizmoguy]

Force of habit really, which isn't a good enough reason.

I have now fixed all rubocop issues and tests seem to all pass now.

[edestecd]

Super. Thanks for the contribution!