Update dependencies.
Allow to override the default api key.

Now you can pass :api_key => "another_api_key" to any API method. For
example:

      user = Authy::API.register_user(:email => "email@example.com", :cellphone => "473-234-8877", :country_code => 1, :api_key => "api_key")
Add more specs.

The specs were restructured too.
Bump version.
Regenerate gemspec.
Remove typhoeus dependency.

It was replaced by httpclient which has less dependencies and work on
jruby.