Read More Now: added option for inline button

The big wide button for Read More Now is kind of hard for me to focus on, so I made an option for a smaller button that sits inline with the post text.

![prefs](https://cloud.githubusercontent.com/assets/615609/2647253/70e8579e-bf48-11e3-80ec-1a934a0e5931.png)
![block](https://cloud.githubusercontent.com/assets/615609/2647179/c66ddb04-bf47-11e3-9bc4-e02917b5701b.png)
![inline](https://cloud.githubusercontent.com/assets/615609/2647180/c673c640-bf47-11e3-93ee-aa3ff04b501b.png)