Style improvements (colour and no blinking)

Using cursor colour from a theme and prevented blinking when editor is not focused

Before and after:

![1](https://cloud.githubusercontent.com/assets/7157049/5288948/88b70e4c-7b31-11e4-9448-3df35a65f265.png) ![2](https://cloud.githubusercontent.com/assets/7157049/5288949/88c08486-7b31-11e4-9680-a7f3268bd0a5.png)