Upgraded RSpec to 3.1.0 and HTTParty to 0.13.3
Transpec'ed to use updated RSpec syntax
Silenced internal gem warnings over unused variables and uninitialized @body_parts reference.
Rubocop is love.
Merge pull request #45 from just3ws/master

Came to silence an uninitialized @body_parts but thought I'd tidy up a little while I was here.