README updates
Ignore Gemfile.lock

Gemfile.lock turns out to be neither committed, nor ignored.
Committing it is a good idea for apps but ignoring is more suitable
for libraries.
Update README.md: Connect to RabbitMQ before publishing messages.

Just to make first-time users happy.
Merge pull request #31 from nfo/patch-1

Update README.md: Connect to RabbitMQ before publishing messages.
Merge pull request #30 from michaelklishin/patch-2

Ignore Gemfile.lock
Lock Bundler to 0.1.x

twiddle wakka is twiddle
Merge pull request #26 from michaelklishin/patch-1

README updates
Merge pull request #28 from trmnl/master

Fix for #27
Merge pull request #1 from gocardless/master

Merge from gocardless/hutch