Add extra capabilities to Inspector

Added the following capabilities:
* `automationName`
* `deviceName`
* `appWaitActivity`
* `appWaitPackage`
* `deviceReadyTimeout`
* `androidCoverage`

Used the [Appium server capabilities](https://github.com/appium/appium/blob/master/docs/en/caps.md) page for reference.

UI has been updated to keep the appropriate fields enabled still, even when 'Use Remote Server' is enabled.

This pull request additionally contains a fix for the stretching Inspector [preview image](https://cloud.githubusercontent.com/assets/1623997/3132785/60d41142-e813-11e3-9cbc-97fb8f4363b3.png) (noticed when using a 4-inch screen).