Adding missing reference to markdown requirement in readme file
Lans in the past can no longer be attended, and lans that are startet can no longer be unattended
Adding view to export paid attendees for any given LAN
Updating README to reflect that we need xlwt
Combining first and last name into same field
Merge pull request #76 from dotKom/excel-export

Excel export of paid users and a quick fix for user being allowed to "change history"