Added addMember.php and editMember.php

These two new pages allow the user to add and edit a member.
Also, adminCenter was updated to work with these two new pages
Also added addMemberConfirm. Altho not currently used, it contains code
to check for duplicate emails when adding members

Still to be done:
-stripslash the user input
-check to make sure email isn't already taken when adding member
-initially hide password fields on edit
-allow password fields to be blank on edit
-remove the old pages from the repository (register_member, r_m_confirm,
etc.) getUserInfo.php is still in use, addMemberConfirm may be required
(?)