Pull Request from erasmussen2/develop

[gh-447] Hide administrators at admin/people from non-administrators unless the adiministrator belongs to other roles.

Avoid a call to http://directory.unl.edu/service.php?format=json&uid=Anonymous

[gh-438] Handle cases where a non-url is passed in or if file_get_contents() returns NULL.  Also remove @ from a call as requested.

[gh-438] Replace file_get_contents with a wrapper (unl_url_get_contents) that will cache the results based on the requested URL's cache headers.

UNL fix applied to WBM 1.2 upgrade in commit 74670880
was mistakening placed inside if statement.