Improved flaky Paper Submission spec
Reload newly created paper.

For some reason the belongsTo relationship on the newly created paper's
tasks were pointing to an empty Paper record.  Reloading fixes it for
now.  This should be fixed in the latest beta of ember data.
Simplified isEditable logic
Merge branch 'master' into editable-new-papers

Conflicts:
	app/assets/javascripts/controllers/task_controller.js.coffee
Missed an admin -> siteAdmin switch
Merge pull request #512 from Tahi-project/editable-new-papers

Make new papers' tasks editable by default