Update some WordPress API calls and some PHP 7 support #21
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Added multi-site support for switch to blog functionality
and updated calls to use the newer WordPress user object.
Replace deprecated get_usermetadata call with get_user_meta.
Check for index 'redirect_to' for $_REQUEST before calling
shibboleth_session_initiator_url to avoid PHP notice.
Updated deprecated call update_usermeta to update_user_metada.
Replaced a call to the split() function with explode() since
split is deprecated in PHP 5.3 and is no longer available
in PHP 7.