Refactor parser base classes
Add Peddler as a dependency
Add stubs for requests
Add structured_list helper
Extract structured list to a class
Add a Request Params class
Remove obsolete file
Add order requests
Bump peddler
Ignore Gemfile.lock
Merge branch 'client' of github.com:papercavalier/mws-orders into client

* 'client' of github.com:papercavalier/mws-orders:
  Ignore Gemfile.lock
  Bump peddler
  Add order requests
  Remove obsolete file
  str list
  params
  Refactor request parameters
  Add a Request Params class
  Extract structured list to a class
  Add structured_list helper
  Add stubs for requests
  Add Peddler as a dependency