initial stab at excel export
generate xls bitches
Change barcode.pdf to correct extension png
#247
better syntax
Cosmetic changes barcode
trying to solve #249
Fix #249
add delayed_job
needs some cleanup, but it's starting to look good
final fixes for xls export, dear god, what a system
add view for when no xls is present
Merge pull request #250 from ZeusWPI/feature/xls-export

Feature/xls export
Merge branch 'master' into statistics

Conflicts:
	Isengard/Gemfile
	Isengard/app/controllers/events_controller.rb
	Isengard/db/schema.rb