title: How to have an empty col-md-* in bootstrap?
body: <p>I'm trying to have two unequal columns in Bootstrap.
  I want to have one column on each side (so if there are columns from 1 to 12, 1 and 12 will be empty), and col-md-2~5 is one column, and 6~11 is another column.</p>
  
  <p>I can't really find an example for this (other than the offset). Can someone help me?</p>