Added Options Page

Added Options Page allowing user to customize shortcuts and other parameters such as rewind time and playback speed change step size

![image](https://cloud.githubusercontent.com/assets/7570412/3928486/0dcb89d8-240b-11e4-873f-fccdf8cb7de9.png)

Let's default to original 0.1 value. 0.25x is too coarse.