Extracting method #load_configuration_load_paths!

The #load_application! method's body had two levels of abstraction.
Extracting #load_configuration_load_paths!

Given that #load_application! then had two methods and was called in a
singular place (i.e. #load!), moved the #load_rack!
and #load_configuration_load_paths! up into the #load! method.
Further extraction of methods

As there are large method bodies, I wanted to decompose those methods
into smaller parts, with meaningful (to me) names.
Merge pull request #78 from jeremyf/refactor-method-abstraction

Extracting method #load_configuration_load_paths!