rm rspec dependency
Switch to DNSimple versioned API
Cleanup documentation and resource representations

Remove deprecated attributes and make the documentation more consistent.
Remove :host key in SQS request method to eliminate excon error
Merge pull request #2585 from smeyfroi/sns_fix_for_excon_parser_change

Remove :host key in SNS request method to eliminate excon error
Merge pull request #2581 from weppos/dnsimple-versioned

[dnsimple] Add support for versioned API
Merge pull request #2579 from josephholsten/rm-rspec

rm rspec dependency