adds binstubs
adds checkout_allowed? to order with basic function
adds timecop gem
adds preferences
adds specs
renames extension to spree_order_constraints
changes have in has
uses shorter syntax to access spree prefs
refactors spec to be clearer
adds Timecop in before blocks
adds try methods when fetching constraints
adds specs for AppConfiguration
adds first admin basic prefrences
refactors for clarity

closes #1
updates override to support refactored keys
removes datepicker formatting

that is not needed anymore
changes describe
updates the README
removes some lefover names
renames folder to new name