Feature/gemify

Wraps this project in a gem which creates rake tasks for starting and stopping Marmotta.  For now, these tasks can be used as instructed `README.md`.  

In the longer term, they are meant to be included in another project's tasks, to create a project specific environment.  That will require a task to download either the marmotta files (and unzip them) or a runnable `jar`.  It probably would also benefit from project specific configuration (especially the port used by Tomcat).

Also adds (possibly temporarily) a vagrant environment for more reliable spin-up. 
This should access the repository from localhost before finishing.  Marmotta has a freakout about port numbers if you access it through the vagrant net interfaces first.

Might also be a good idea for this to setup a default admin password; see http://marmotta.apache.org/platform/security-module.html:

```curl -X POST -H "Content-Type: application/json" -d '["standard"]' http://<HOST>:<PORT>/marmotta/config/data/security.profile```