Fixed typo in view_assignment.

* "Select one of more files [...]" should be
  "Select one or more files [...]"
Fixed problem with CSV files in wrong places.
Merge branch 'master' of github.com:galah-group/galah into v0.2stable

Conflicts:
	galah/web/templates/assignment.html
Merge branch 'v0.2stable' of github.com:galah-group/galah into v0.2stable