Move extra services to core

These were missed in the initial work.
Merge pull request #14 from fog/additional_services

Move extra services to core
bump excon dependency
loosen excon dep
v1.21.0
add changelog
Clone init attributes to prevent side effects
Package all files in gems
Merge pull request #26 from domcleal/gemspec-all-files

Package all files in gems
Merge pull request #25 from wchrisjohnson/clone-model-init-attribs

Clone init attributes to prevent side effects
Add homepage to gemspec
Merge pull request #27 from anatol/patch-1

Add homepage to gemspec
Removed dev dependencies to Gemfile
Ported fog attribute spec to minitest
Ported from Shindo
Ported connection_test from shindo
Ported current_machine_test from shindo
Ported mocking_test from shindo
Ported service_test from shindo
Ported timeout_test from shindo