Starting some changes to make better the way to search for users in manage page
Add option to disapprove user and admin options in users/edit

Now users approved can be easily disapproved by admins.
Admins have also access to all the options that were previously only on
mange/users when they are editing a single user at users/:id/edit

refs #953
Finish the filter of users in manage/users

Included a new js component called ResourceFilter. Used in pages where the user
can type in a text input and filter the results shown in the view, as is done
now in manage/users.

refs #958
Implement filter of spaces in manage/spaces

The same filter that is used in manage/users, see ffe8582bbc.
Also improved the way the view looks and fixed/verified both UsersController#enable
and SpacesController#enable. Some links and some logic were wrong before.
Added tests for everything.

refs #958, refs #957