Add smokey check for imminence sign in
specify gem path locally

Deploy user cannot install gems to system default. So install locally instead
correcting typo
including govuk_setenv to smokey
adding new Rake test to avoid EFG

Skyscape preview does not have EFG (we left it in EC2 for now)
Adding new whitehall test for non-auth http

Previously, all http was authenticated by default, even
www.*.alphagov.co.uk - and this is desirable in preview only. A
new whitehall-only case has been implemented to explicitly ensure
AUTH_USERNAME and AUTH_PASSWORD are uninstantiated.
setting env var dependencies

Rather than defaulting to `govuk_setenv`, the standard so far is to
explicitly export the required variables. This also avoids the need to
roll out scripts on jenkins boxes
allowing for custom rake tasks

Currently only two options available. I've opened it up to pass
via cmdline
Merge pull request #17 from alphagov/smokey-initialise

New Smokey task to avoid EFG
Merge pull request #16 from alphagov/add-check-for-imminence

Add smokey check for imminence sign in
Merge branch 'master' into whitehall-bug

Conflicts:
	Rakefile
Merge pull request #18 from alphagov/whitehall-bug

Whitehall bug fix to enforce no auth over HTTP
added the vars, forgot to remove govuk_setenv
correcting tag Rake task
`set -e` is our friend
When re-running the check, we should source the environment
We will need to be in /opt/smokey to run this check
Fix missing quote
Tell smokey about imminence
Remove unused nagios.sh