admin: Show only useful quotas

Fix apyrgio/synnefo#212
admin: Make public networks stand out

Add a "PUBLIC" badge to public networks in details.

Fix apyrgio/synnefo#209
admin: Remove link from main item

Fix apyrgio/synnefo#168
admin: Display the pluralized name of resources

Fix apyrgio/synnefo#166
admin: Remove "No public ip" from VM details

Fix apyrgio/synnefo#165
Merge branch 'feature-admin-minor-fixes' into feature-admin