Refactor multi coastal implementation in Order.  Merge from e00c6a5 orders

@multi_coastal is an array containing all of the orders that are multi-coastal in nature.

i.e.
'F Stp(sc) S F Bal-Bot',
'A Sev S F Bul(ec)-Bla',
'A Sev S F Bla-Bul(ec)',

-Order
  -@coastal => @multi_coastal
  -is_coastal? => is_multi_coastal?
  -refactored and documented regex, order.rb:87 in init_aux

-Order Spec
  -add passing specs for mc support & move order

Conflicts:
	lib/diplo/order.rb
	spec/order_spec.rb