Correction of typo in installer text

Addition of a missing space in the installer text.

![napkin 25 09-12-14 12 58 38 pm](https://cloud.githubusercontent.com/assets/47554/4256358/323840fa-3ab7-11e4-9873-00219fd8cf83.png)

Thanks for the awesome tool! I apologize I could not unsee this typo.