admin: Show project quotas

Project quotas are shown in two different places:

a) In the project summary, where they have to be displayed horizontally
and
b) in the details of a project, where they should be shown vertically.

Besides showing the project quotas properly, we must show and the
requested project application resources properly, since we currently
have no direct way to show them.

Therefore, for each project we will show either the latest state of its
quotas or the latest state of its application resources.

Fix apyrgio/synnefo#215
admin: Show members with their status

Show project members just like `snf-manage project-show`.

Fix apyrgio/synnefo#203
admin: Return contact info for system projects

Fix apyrgio/synnefo#214
Fix apyrgio/synnefo#213
Merge branch 'feature-admin-projects' into feature-admin