title: How to convert map to url query string?
body: <p>Do you know of any utility class/library, that can convert Map into URL-friendly query string?</p>
  
  <p>Example:</p>
  
  <p>I have a map:</p>
  
  <pre><code>"param1"=12,
  "param2"="cat"
  </code></pre>
  
  <p>I want to get: </p>
  
  <pre><code>param1=12&amp;param2=cat
  </code></pre>
  
  <p>final output</p>
  
  <pre><code>relativeUrl+param1=12&amp;param2=cat
  </code></pre>