fix disks and servers live tests
remove some test output, add size_gb as a required field for disk creation
rewrite the way model is waited in live tests
fix asynchronious disks collection tests
fix object test (it already was shared object with such name somewhere)
fix live tests for google engine
add new line to the end of google_tests_helper.rb
fix 1.8.7 compatibility
Support for required EvaluateTargetHealth for ALIAS records

Note an error was being raised when using the old API about EvaluateTargetHealth being missing.

```
Excon::Errors::BadRequest: Expected(200) <=> Actual(400 Bad Request)
  response => #<Excon::Response:0x007fde3baf66a0 @data={:body=>"<?xml version=\"1.0\"?>\n<ErrorResponse xmlns=\"https://route53.amazonaws.com/doc/2013-04-01/\"><Error><Type>Sender</Type><Code>InvalidInput</Code><Message>Invalid XML ; cvc-complex-type.2.4.b: The content of element 'AliasTarget' is not complete. One of '{&quot;https://route53.amazonaws.com/doc/2013-04-01/&quot;:EvaluateTargetHealth}' is expected.</Message></Error><RequestId>f141b55c-f726-11e3-b2ac-73337c63db62</RequestId></ErrorResponse>", :headers=>{"x-amzn-RequestId"=>"f141b55c-f726-11e3-b2ac-73337c63db62", "Content-Type"=>"text/xml", "Content-Length"=>"438", "Date"=>"Wed, 18 Jun 2014 20:27:17 GMT"}, :status=>400, :remote_ip=>"72.21.214.31", :local_port=>60240, :local_address=>"192.168.1.85"}, @body="<?xml version=\"1.0\"?>\n<ErrorResponse xmlns=\"https://route53.amazonaws.com/doc/2013-04-01/\"><Error><Type>Sender</Type><Code>InvalidInput</Code><Message>Invalid XML ; cvc-complex-type.2.4.b: The content of element 'AliasTarget' is not complete. One of '{&quot;https://route53.amazonaws.com/doc/2013-04-01/&quot;:EvaluateTargetHealth}' is expected.</Message></Error><RequestId>f141b55c-f726-11e3-b2ac-73337c63db62</RequestId></ErrorResponse>", @headers={"x-amzn-RequestId"=>"f141b55c-f726-11e3-b2ac-73337c63db62", "Content-Type"=>"text/xml", "Content-Length"=>"438", "Date"=>"Wed, 18 Jun 2014 20:27:17 GMT"}, @status=400, @remote_ip="72.21.214.31", @local_port=60240, @local_address="192.168.1.85">
	from /gems/ruby-2.0.0-p353/gems/excon-0.37.0/lib/excon/middlewares/expects.rb:6:in `response_call'
	from /gems/ruby-2.0.0-p353/gems/excon-0.37.0/lib/excon/middlewares/response_parser.rb:26:in `response_call'
	from /gems/ruby-2.0.0-p353/gems/excon-0.37.0/lib/excon/connection.rb:402:in `response'
	from /gems/ruby-2.0.0-p353/gems/excon-0.37.0/lib/excon/connection.rb:272:in `request'
	from /gems/ruby-2.0.0-p353/gems/fog-1.22.1/lib/fog/xml/sax_parser_connection.rb:35:in `request'
	from /gems/ruby-2.0.0-p353/gems/fog-1.22.1/lib/fog/xml.rb:21:in `request'
	from /gems/ruby-2.0.0-p353/gems/fog-1.22.1/lib/fog/aws/dns.rb:126:in `request'
	from /gems/ruby-2.0.0-p353/gems/fog-1.22.1/lib/fog/aws/requests/dns/change_resource_record_sets.rb:120:in `change_resource_record_sets'
```
Update links to DigitalOcean SSH-key docs
remove www subdomain from digital ocean ssh-key links
merge with master
Merge pull request #3005 from ably-forks/evaluate_target_health-support

Support for required EvaluateTargetHealth for ALIAS records
Merge pull request #3007 from mattbreeden/update_doc_urls

Update links to DigitalOcean SSH-key docs
Merge pull request #2995 from allomov/google-live-tests

[google|tests] Fix disks and servers live tests