Add enable_per_project_billing field to companies.
Enable billing Checkbox on company edit.
Only show billing related things if enabled at the company level

  Affected areas:
  * Billing tab in the top menu (+ restrict access to billing)
  * Services under Admin panel
  * Service under Task atttributes
  * Suppress Billing under Project show and edit
Adjust billable logic.
Hungarian localization.
Rename company enable_per_project_billing attribute to use_billing (migration change also!).
Added spec for User#can_use_billing?
Added spec for Project#billing_enabled?
Fix Project#billing_enabled?
	* in the case of not (yet) existing company
Cucumber config.
Cuke for billing tab visibility
	* based on company use_billing flag
Cuke for seeing the Services tab
	* based on company use_billing flag
Cuke for seeing Suppress Billing on Project edit/show
	* based on company use_billing flag
Scenario titles.
Gemfile : move machinist from development to test/cucumber.
Show billing tab when company billing disabled, but rename it to reports.
Merge branch 'company_level_billing_restriction' into fluenta

Conflicts:
	features/step_definitions/authentication_steps.rb
	features/step_definitions/debug_steps.rb
	features/step_definitions/web_steps.rb
	features/support/env.rb
	spec/features/use_resources_spec.rb
Run migrations
Handle use_billing on template