Add fromAMQP and toAMQP library adapters.

Stream messages to and from AMQP brokers with support for multiple types
of exchanges.  Tested with Ruby publisher, stream parsing in
streamtools, and Ruby consumer on another topic routing key all through
RabbitMQ.
jq-formatted json for demo patterns
Removed now unnecessary tutorial route handlers
apiwrap /examples responses to include headers
Merge pull request #431 from jacqui/json-format

jq-formatted json for demo patterns
Merge pull request #432 from jacqui/api-handlers

cleanup of api route handlers
Merge pull request #430 from nickjones/amqp_rebased

Add fromAMQP and toAMQP library adapters.
v0.2.5
Merge pull request #433 from mikedewar/v0.2.5

v0.2.5
first whack at retries
little fix to the toEmail block to stop it crashing on delete
first draft of the categorical distribution block
categorical distirbution take two
Merge pull request #436 from mikedewar/emailfix

little fix to the toEmail block to stop it crashing on delete
check for zero normalising constnat
removed tutorials from the repo
slowly slowly
Merge pull request #438 from jacqui/dont-build-tutorials

removed tutorials from the repo
Merge pull request #437 from mikedewar/categorical

Categorical
Create README.md