use the given channel prefix option in Travis::Amqp::Consumer (march_hare)
upgrade rspec to 2.99.beta1 (rspec-it is now incompatible with the version used)
always default channel prefetch
Merge branch 'master' into sf-amqp-use-prefix-option

Conflicts:
	Gemfile
Merge pull request #14 from travis-ci/sf-amqp-use-prefix-option

Use the given channel prefix option in Travis::Amqp::Consumer (march_hare)