Add members uses file upload.

- Replaces copying contents of csv file into textarea.
- Handles newlines delimited with \r, \r\n, or \n.
Fixed port error.
Updated data validation for adding members
Added single member mode to add users feature.

- Form provides easy method for admins to add a single member to the
  house website.
Removed trailing whitespace and outdated comment.
Merge pull request #38 from RuddockHouse/add_members_changes

Add members changes