Revert "Switch to using FakeWeb to mock API responses"

This reverts commit d99f7775ca4e361f8a1874995b3d1a6147ea5ea5.

This also speeds up tests considerably.

Conflicts:
	spec/lib/comments_spec.rb
	spec/lib/projects_spec.rb
	spec/lib/taskmapper-basecamp_spec.rb
	spec/lib/tickets_spec.rb
	spec/spec_helper.rb