Change ActiveMQ download URL

Current is struggling, so changing to a better one (I hope so).
Update ActiveMQ cookbook
Add license information

fixes #14
flake8 + doc fixes
Don't use Chef for ActiveMQ

Since ActiveMQ is managed on Travis with just a script, use the same
script for Vagrant.
Merge branch 'bug/activemq_setup'
Add Python 2.6 importlib requirement

fixes #15
TimeoutError is raised for the listener

Instead of the connector.
Setup and document non Vagrant integration tests
Remove debugging echo
Fix solo.rb cookbooks path
Local middlewares setup docs fixes
Scripts, docs. and chef fixes for local setup