Enable calling FastlyRails from Rake
Enable calling FastlyRails from Rake

Modify the Rakefile so that it's able to find
FastlyRails.purge_all() to call it.
We do this specially so that we don't have to bring in an
entire copy of the Rails environment (we don't need it).

Signed-off-by: David A. Wheeler <9ae72d22d8b894b865a7a496af4fab6320e6abb2@dwheeler.com>

linuxfoundation/cii-best-practices-badge,linuxfoundation/cii-best-practices-badge,coreinfrastructure/best-practices-badge,coreinfrastructure/best-practices-badge,linuxfoundation/cii-best-practices-badge,linuxfoundation/cii-best-practices-badge,coreinfrastructure/best-practices-badge,coreinfrastructure/best-practices-badge