Added showImages support for ridewithgps.com

Example for link list:
![screenshot 2014-04-03 17 50 14](https://cloud.githubusercontent.com/assets/248467/2610876/c366e552-bb93-11e3-8d26-dd0fcc436828.png)

Example in comments:
![screenshot 2014-04-03 17 50 26](https://cloud.githubusercontent.com/assets/248467/2610873/bbf05ea2-bb93-11e3-872b-fd15836ac9f2.png)