fix filenames for export to pdf/xls

app/views/admin/registrations/index.pdf.prawn

@@ -0,0 +1,38 @@
+prawn_document(:force_download=>true, :filename => @pdf_filename) do |pdf|
+  table_array = []
+  header_array = ["   ",
+                  "Last Name",
+                  "First Name",
+                  "Public Name",
+                  "Email",
+                  "Attending Social Events",
+                  "Attending With Partner",
+                  "Arrival Date",
+                  "Departure Date"]
+  table_array << header_array
+  @registrations.each do |registration|
+    row = []
+    row << ""
+    row << registration.last_name
+    row << registration.first_name
+    row << registration.public_name
+    row << registration.email
+    if registration.attending_social_events
+      row << "X"
+    else
+      row << " "
+    end
+
+    if registration.attending_with_partner.to_s
+      row << "X"
+    else
+      row << " "
+    end
+    row << registration.arrival.to_s
+    row << registration.departure.to_s
+    table_array << row
+  end
+
+  pdf.text "#{@conference.title} Registrations", :font_size => 25
+  pdf.table table_array, :header => true, :cell_style => {:size => 5, :border_width => 1}
+end