removing the last traces of half-assignments. Issue #541.

examples/code.coffee

@@ -60,8 +60,8 @@ race = ->
   race()
 
 # Conditional assignment:
-good = or evil
-wine = and cheese
+good or= evil
+wine and= cheese
 
 # Nested property access and calls.
 ((moon.turn(360))).shapes[3].move({x: 45, y: 30}).position['top'].offset('x')

examples/computer_science/linked_list.coffee

@@ -12,7 +12,7 @@ class LinkedList
     # Create a new node object to wrap the data.
     node = data: data, next: null
 
-    current = this._head = or node
+    current = this._head or= node
 
     if this._head isnt node
       (current = current.next) while current.next

examples/poignant.coffee

@@ -46,7 +46,7 @@ LotteryDraw =
       ticket_list.each (ticket) ->
         score = ticket.score result
         return if score is 0
-        winners[buyer] = or []
+        winners[buyer] or= []
         winners[buyer].push [ticket, score]
     this.tickets = {}
     winners