Prep for 1.0.0

[todd]

• Removes external dependency on RestClient in favor of stdlib Net::HTTP.
• Drop support for Ruby 1.9.3.
• Use kwargs in favor of options hashes.
• Doc updates.

cc @manfrin @Kimtaro @matteofigus

[matteofigus]

Looks great @todd.

Given you are prepping for v1, perhaps I would add (but we can do it later really) support for a RenderComponents functionality too. Basically, now the registry implements a POST route (its base url) where you can ask for multiple components with a single request - this is beneficial if you want to make a request on the server-side for multiple components and I think it would be a good addition to the client