title: DateTime.iso8601('2014-07-08T17:51:36.000Z') results in NoMethodError?
body: <p>I can't seem to get DateTime to handle a legitimate ISO-8601 String.</p>
  
  <pre><code>jruby-1.7.19 :013 &gt; DateTime.iso8601('2014-07-08T17:51:36.000Z')
  NoMethodError: undefined method `/' for "000":String
          from /Users/robert.kuhar/.rvm/rubies/jruby-1.7.19/lib/ruby/1.9/date.rb:1778:in `new_by_frags'
          from /Users/robert.kuhar/.rvm/rubies/jruby-1.7.19/lib/ruby/1.9/date.rb:1829:in `iso8601'
          from (irb):13:in `evaluate'
          from org/jruby/RubyKernel.java:1107:in `eval'
          from org/jruby/RubyKernel.java:1507:in `loop'
          from org/jruby/RubyKernel.java:1270:in `catch'
          from org/jruby/RubyKernel.java:1270:in `catch'
          from /Users/robert.kuhar/.rvm/rubies/jruby-1.7.19/bin/irb:13:in `(root)'
  </code></pre>
  
  <p>How do I dig out of this?</p>