Update main README--change word order for clarity

Same change occurs in two places: line 68 and line 110.  Just for better readability.

before:
![screen shot 2014-10-12 at 2 07 01 am](https://cloud.githubusercontent.com/assets/4251807/4605613/3dfd591c-51ef-11e4-9eca-8ede82a4bd88.png)

after:
![screen shot 2014-10-12 at 2 07 28 am](https://cloud.githubusercontent.com/assets/4251807/4605616/5647131e-51ef-11e4-88c9-427458f6e060.png)