 @returns The number truncated to the nearest integer of less than or equal value.
 
 <code><pre>
-   (4.9).floor()
-=> 4
-
-   (4.2).floor()
+   4.9.floor()
+=> 4
+
+   4.2.floor()
 => 4
 
    (-1.2).floor()


@type Boolean
@returns true if this number is an even integer, false otherwise.
###
Number::even = ->
  this % 2 == 0

@returns The number truncated to the nearest integer of greater than or equal value.

<code><pre>
   4.9.ceil() 
=> 5

   4.2.ceil()
=> 5

   (-1.2).ceil()
