dev-haskell/happstack-server: bump up to 7.3.7

Package-Manager: portage-2.2.10_p39
dev-haskell/happstack-hstringtemplate: bump up to 7.0.4

Package-Manager: portage-2.2.10_p39
dev-haskell/happstack-hsp: bump up to 7.3.1

Package-Manager: portage-2.2.10_p39