Apply class native-key-bindings

As @EntilZha figured out, adding class `native-key-bindings` to the view allows for use of keys within the pane. This fixes #78, allowing people to copy output from the terminal output.

![copypasta](https://f.cloud.github.com/assets/836375/2507720/61cfabee-b3c3-11e3-9698-c948ba158732.gif)