title: ruby new hash colon notation with string keys
body: <p>Using ruby 1.9.3, string keys don't seem to work with Hash colon notation:</p>
  
  <pre><code>1.9.3p194 :005 &gt; {abc: 5}
   =&gt; {:abc=&gt;5} 
  
  1.9.3p194 :004 &gt; {'abc': 5}
  SyntaxError: (irb):4: syntax error, unexpected ':', expecting tASSOC
  {'abc': 5}
         ^
  </code></pre>
  
  <p>I think I'm running the right version of Ruby</p>
  
  <pre><code>1.9.3p194 :006 &gt; RUBY_ENGINE
   =&gt; "ruby" 
  1.9.3p194 :007 &gt; RUBY_VERSION
   =&gt; "1.9.3" 
  </code></pre>