admin: Add filter to exclude auth providers

Fix apyrgio/synnefo#101
Merge branch 'feature-admin-auth-filter' into feature-admin
admin: Reply with JSON response on action

This theoretically should fix the issue apyrgio/synnefo#15, but the only
thing that remains is to send properly the action ids. Currently, they
are sent like this:

 '[id1, id2]'

when they should be sent like this:

 ['id1', 'id2']
Merge branch 'feature-admin-actions-json' into feature-admin
admin: Add owner name in project list

Fix apyrgio/synnefo#105
Merge branch 'feature-admin-project-owner' into feature-admin
admin: Add logout option

Redirect to the logout url as specified by astakos.
I believe that the issue apyrgio/synnefo#117 is not resolved yet, as I
am not sure if this is a generic solution.
Merge branch 'feature-admin-logout' into feature-admin
admin: Refactor contact option

Fix apyrgio/synnefo#118
admin: Add email legend

Add legend for email variables.
Merge branch 'feature-admin-email' into feature-admin
admin-ui: Update functionality and design of modals
Merge branch 'feature-admin-ui-new' into feature-admin
admin: Fix contact in networks
admin: Fix logout in home page
admin: Semi-fix navigation bar
Merge branch 'feature-admin-last-minute' into feature-admin
admin-ui: Add clear-all functionality

Fix apyrgio/synnefo#124
admin-ui: Disable the selection of a row by clicking on it

Now, in order to select a row, the user must clicks in the checkbox.

Fix apyrgio/synnefo#108
admin-ui: Add some tooltips

Fix apyrgio/synnefo#112