Update jclouds to 1.7.1 and remove custom security-groups code.
Pull storm from new apache repo. Fixes #52
Update ssh-agent libraries.
Clean-up code in provision.clj.
Add install method switch to accomodate storm 0.9.1 onwards.
Code cleanup of node.clj
Forward install method option to specs.
Add support for installing Maven3.
Code cleanup on storm.clj
Ensure the method switch is valid and forward as a key.
Remove maven crate reference from zeromq.clj
Add support for deploying versions 0.9.1+

The deploy command now has an extra parameter, --method, that can be
either 'apache' or 'classic'. With 'apache' method (the default),
storm will be installed using Maven3 if installed from source. When
using 'classic', storm will be installed using 'leiningen' when
installing from source.

Currently there is no option to install from released artifact.
Remove usage of maven from zeroMQ.
Fix issue where the method wasn't threaded correctly.
Fix shutdown. Method wasn't threaded correctly.
Fix security group authorization.
Remove jclouds copyright from security.clj, as their code was removed.
Fix typo that prevented classic mode from running.
Add comments to storm install code.