Closes #8 adding the 'trim' option

index.html

@@ -210,9 +210,15 @@ <h2>Loooooooong Strings</h2>
 
     <h2>With the `data-colorifier="{gutter: false}"` option</h2>
 <pre data-lang="undefined" data-colorifier='{"gutter": false}'>
-  Some
-    random
-      code
+Some
+  random
+    code
+</pre>
+
+    <h2>Trailing spaces trimming disabled</h2>
+<pre data-lang="undefined" data-colorifier='{"trim" : false}'>
+    something: ->
+      boo(hoo)
 </pre>
 
     <p class="white-space"></p>

src/colorifier.coffee

@@ -13,6 +13,7 @@ class Colorifier extends Element
       attr:   'data-lang'  # attribute that keeps the language name
       theme:  'light'      # color theme name
       gutter: true         # show or not the gutter
+      trim:   true         # automatically trim trailing spaces
 
     # mass-initializer
     initialize: ()->
@@ -44,20 +45,20 @@ class Colorifier extends Element
   constructor: (element)->
     return @ unless element
 
+    @setOptions(element.data('colorifier'))
+
     super 'div', class: 'colorifier'
 
     text = element.html()
     text = text.replace(/</g, '&lt;')
     text = text.replace(/>/g, '&gt;')
-    text = text.replace(/(^\s+)|(\s+$)/g, '')
+    text = text.replace(/(^\s*\n)|(\s+$)/g, '') if @options.trim
 
     @ref = element.html(this.paint(text))
 
     @style(element.style(@styles2copy))
     @insertTo(element.hide(), 'before')
 
-    @setOptions(element.data('colorifier'))
-
     if @options.gutter
       nums = (i for line, i in text.split("\n"))
       @insert(new Element('div', class: 'gutter', html: nums.join('<br/>')))