def checkout_to(revision, options = {})
      options = {
        :force => false
      }.merge(options)
      git_args = ['checkout', revision]
      git_args << '--force' if options[:force]
      vet_output(git_args)
      true
    end
def checkout_to(revision, options = {})
      options = {
        :force => false
      }.merge(options)
      git_args = ['checkout', revision]
      git_args << '--force' if options[:force]
      vet_output(git_args)
      true
    end
Checkout.

 @param [String] revision for checkout
 @param [Hash] options for checkout
 @option options [TrueClass|FalseClass] :force as true to force checkout

 @return [TrueClass] always true