admin: Add details page for networks

Show in the details page of networks the following association lists:

* VMs
* Network Interfaces
* IP Addresses
* Owner
* Project
admin: Update VM details page

Add the following associated items in the VM details page:

* Users
* Projects
* Volumes
* Networks
* Network Interfaces
* IP Addresses
admin: Update users' details page

The details page of users now include the following associations:
* Quotas
* Projects
* Virtual Machines
* Volumes
* Networks
* Network Interfaces
* IP Addresses
admin: Add volume and IP details pages
admin: Update details page of projects

The project details page is updated mainly to show all Cyclades
resources that directly derive from a project.
Merge branch 'feature-admin-extra-details' into feature-admin

Fix apyrgio/synnefo#73 and fix apyrgio/synnefo#57.