Added space before "target=" when added to href

Fixes bug where the first links in markdown boxes don't work
![screen shot 2014-11-01 at 10 35 43 pm](https://cloud.githubusercontent.com/assets/500587/4872653/8e45bdd4-61ed-11e4-9fc4-737df7163d2c.png)
![screen shot 2014-11-01 at 10 35 21 pm](https://cloud.githubusercontent.com/assets/500587/4872655/8e4f7284-61ed-11e4-88e2-c988a68245d7.png)
![screen shot 2014-11-01 at 10 35 13 pm](https://cloud.githubusercontent.com/assets/500587/4872654/8e4c1814-61ed-11e4-83d2-12365cb04f3b.png)