title: LineString - get coordinates as DataFrame
body: <p>I have a geopandas Dataframe with one <code>GeoSeries</code>.</p>
  
  <p>There is only one entry for this column, a <code>shapely.geometry.linestring.LineString</code>.</p>
  
  <pre><code>LineString (first_lon first_lat, second_lon second_lat, ...)
  </code></pre>
  
  <p>I could not find an easy way to get the coordinates of this <code>LineString</code> as a DataFrame like</p>
  
  <pre><code>LON           LAT
  first_lon     first_LAT
  second_lon    second_LAT
  ...
  </code></pre>
  
  <p>Is there a build in function for this?</p>
  
  <p>Thx</p>