admin: Update project filters

Enable filtering by project/application status or by "is_base"
property.

Fix apyrgio/synnefo#75 and also fix apyrgio/synnefo#95.
Merge branch 'feature-admin-project-filters' into feature-admin
admin: Update user log in details

Add all date-related information in the "Log" section.
Also, update project/user details to user `status_display` instead of
custom template tag `get_state`.

Fix apyrgio/synnefo#99
admin: Remove old template tags
Merge branch 'feature-admin-user-log' into feature-admin
admin: Update action metadata

Change reversible to caution_level and adapt the views where necessary.

Fix apyrgio/synnefo#86
Merge branch 'feature-admin-action-metadata' into feature-admin
admin-ui: Unify the html structure of filters

Fix apyrgio/synnefo#107
admin-ui: Improve functionality for massive actions
admin-ui: Update icon-font

Addition of checkboxes and radiobuttons.
admin-ui: Replace checkboxes and radios with font-icons
Merge branch 'feature-admin-ui-new' into feature-admin
admin-ui: Update layout of table and add "Clear All" btn

There are now checkboxes in the 1st column of the main table and in
the 1st column of the table of selected items. The checkboxes in
the main table are checked when a row is selected and unchecked
when o row is not selected.
The checkboxes in the table of selected items are always checked.

The "Clear All" button triggers a confirmation modal and then the user
can choose to deselect all his selections (not only the visible).