Update the contributors list
minor changes to product description and README
fixed formlib imports to work with Plone 4.1rc3
Re-exposed signup sheet description field, version 1.5.2, for issue 4
Fixed imports so they would not break in Plone 3.3.5, version 1.5.3
for bug 5, fix manager summary so handles users without email addresses
Include the values of the extra fields in CSV export.

Though these values are being stored upon subscription, they were
being ignored during the export.