admin: Add link to details in user index
admin: Add links to various indexes in navbar
admin: Add various fixes
Merge branch 'feature-admin-fixes' into feature-admin
admin: Fix details template
admim: Fix *details templates
Merge branch 'feature-admin-template-fixes' into feature-admin
admin: Add homepage

Add a homepage that has only a navigation bar. The homepage corresponds
to the /admin/ url.

Fixes #24
Merge branch 'feature-admin-home' into feature-admin
admin: Create generic class for model actions

Add AdminAction class, which can be used by any model-view to create
actions for this model. The AdminAction class should be generic enough
and by default provides the following attributes:

    Attributes:
        op:             The action
        name:           The name of the action
        description:    A short text that describes an action
        target:         The target of the action
        severity:       The negative impact of the action.
                        Accepted values: trivial, big, irreversible
        allowed_groups: The groups that are allowed to author this
                        action.

A side feature is that ```views.py``` becomes the entry point for any
view regarding models and has to import other files (model-views) that
will implement the actual indexing or detail functions.

As a result, this commit also introduces ```users.py```, ```vms.py```
and ```projects.py```. The actions are instantiated in these files.

Fixes #28, although it does not follow the proposed solution to this
problem (JSON) and uses classes instead.
Merge branch 'feature-admin-actions' into feature-admin
admin: Fix VM index

Add the required template and fix the index view for VMs. The index page
currently has no items and will be filled in later iterations.
admin: Fix project index

Put the _project_row.html template in the correct directory.
Merge branch 'feature-admin-index-fix' into feature-admin

Fixes #26
admin: Add pages for stats and charts

The urls for these pages are /admin/stats and /admin/charts
respectively. The pages hold currently no content.

Fixes #30
Merge branch 'feature-admin-stats-urls' into feature-admin
admin-ui: Fix js bug (remove item from table in modal)
admin-ui: Fix table bugs
admin-ui: Add reset-table function