change date to date time for creating mission, training and announcement
enable edit of name for stuff management
allow stuff to edit students details
correctes spelling mistake "staff" -> "stuff"
fixed resource loading error when customised theme incorrect
adding multiple file uploads control
auto login app if Facebook is connected
welcome page refactoring
multiple files upload for missions and training
Merge branch 'master' of github.com:Coursemology/coursemology.org into development

Conflicts:
	app/controllers/submissions_controller.rb
	app/controllers/trainings_controller.rb
	app/views/submissions/show_question.html.erb
	db/schema.rb
Merge branch 'master' of github.com:Coursemology/coursemology.org into development