Removing unnecessary parens and removing the sudo recommendation for npm in the readme.

README

@@ -26,7 +26,7 @@
   sudo bin/cake install
   
   Or, if you have the Node Package Manager installed:
-  sudo npm install coffee-script
+  npm install coffee-script
   
   Compile a script:
   coffee /path/to/script.coffee

src/nodes.coffee

@@ -1460,7 +1460,7 @@ exports.If = class If extends Base
 Push =
   wrap: (name, expressions) ->
     return expressions if expressions.empty() or
-        (last(expressions.expressions)).containsPureStatement()
+        last(expressions.expressions).containsPureStatement()
     expressions.push new Call(new Value new Literal(name), [new Accessor new Literal 'push']
         [expressions.pop()])