Improve searching users

[jcvanderwal]

It's difficult to find the users. Some suggestions:

Add:

• allUsers

Implement wildcard search on:
-findByUsername
-findByName

[danhaywood]

It turns out that there is already an ApplicationUsers#allUsers(), but it is marked as being prototype. I've removed this to make it always available. (Any given app can always suppress the action again either through security or by writing a vetoing subscriber).

Also, the findByName already supports wildcards, %x% to match any occurrence of 'x' in either the familyName, givenName or knownAs.