title: Scala containsSlice implementation
body: <p>In scala containsSlice returns true if we've a sublist in a List with order maintained. Ex.</p>
  <pre><code>val sublst = List(1,2,3,4)
  val lst = List(1,2,3,4,5,6)
  println(lst.containsSlice(sublst)) // true
  </code></pre>
  <p>Is there a way to write this logic without using this method?</p>