bumping plek to 1.0.0

Updated tests to use dev.gov.uk (and therefore 'dev' #{environment}).
It is known that factchecker emails have a temporary workaround at time of writing and this will be revisited by @mnowster. For now, in skyscape preview, we will configure such that no emails are sent
Upgrade to Rails 3.2.11
Merge branch 'bump-plek'

Conflicts:
	Gemfile
	Gemfile.lock