Clearify ::Page so there is no confusion with Crabgrass::Page

This caused travis build to fail before.
do not depend on active support in crabrass/info

it's loaded very early - even before AS
updated Gemfile.lock

I guess this is due to dependencies moved into gemspec from Gemfile
do not require the engine by default

If we run Crabgrass::Application directly we don't want to load the engine as it duplicates everything.
Had to move the require statements out of the engine file into new crabgrass/dependencies.