Merge pull request #24 from sportngin/feature/queue-size

add queue.size method with implementations for sqs and iron_mq
Version bump
Merge branch 'master' of github.com:sportngin/queuel
Update README

Let everyone know that we also support SQS.
gemfile updates on version change
Merge branch 'master' into feature/queue-size

Conflicts:
	Gemfile.lock
	lib/queuel/version.rb