Feature flight screen update

@arthurbenemann  @Craig3DRobotics 

Based on Craig feedback, and using his telemetry widget update pull request, I update the app ui to make it more consistent for both phones and tablets.
The update also takes advantage of Android Kitkat features to improve the app viewing area on devices running kitkat.

Here are some screenshots to highlight the changes:
* Nexus 4 running Android Kitkat (belongs to the same category as the Note 3 in terms of screen size category):
              
![nexus4_port_flight](https://cloud.githubusercontent.com/assets/914968/3151074/6892d7de-ea7e-11e3-8de2-8dff60e4c4a1.png)


![nexus4_land_flight](https://cloud.githubusercontent.com/assets/914968/3151101/a7dc6716-ea7e-11e3-8aa4-03cca08e1406.png)


![nexus4_port_editor](https://cloud.githubusercontent.com/assets/914968/3151073/688ff9e2-ea7e-11e3-9e7f-5e70838f540a.png) 


![nexus4_land_editor](https://cloud.githubusercontent.com/assets/914968/3151106/aea39808-ea7e-11e3-8b57-bf84d5bf5d49.png)
​ 
​ 
* Nexus 7 (2012) running Android Kitkat:
           
![nexus7_port_flight](https://cloud.githubusercontent.com/assets/914968/3151116/cfe4444a-ea7e-11e3-9e6a-cd26b7951b1a.png)


![nexus7_land_flight](https://cloud.githubusercontent.com/assets/914968/3151124/dc3fa540-ea7e-11e3-83fb-6c4a3e100d9c.png)


![nexus7_port_editor](https://cloud.githubusercontent.com/assets/914968/3151122/d7836e7e-ea7e-11e3-9c37-64eda1f291aa.png)


![nexus7_land_editor](https://cloud.githubusercontent.com/assets/914968/3151126/e60f4670-ea7e-11e3-8c27-d74fec582453.png)
     
​
The 'Air Time' that is usually on the action bar was moved to the telemetry fragment. This helps maintain consistency in the telemetry fragment despite the orientation, and helps reduce clutter in the action bar.

As you can notice, Android KitKat allows app to set the status bar and/or navigation bar transparency mode. I made use of that feature to increase the map viewing area. On devices not running KitKat, only the action bar becomes transparent. That still significantly increase the map viewing area as well.​

For this update, I decided to have the action bar adopt a dark theme to facilitate viewing of the action bar items despite the translucency.
To maintain consistency, the action bar in the rest of the app was updated to the Holo.Light.DarkActionBar theme.

![nexus4_port_settings](https://cloud.githubusercontent.com/assets/914968/3151142/00a542b4-ea7f-11e3-9931-8e7f31c522fb.png)



I'm updating the action bar item icons to render better on the new dark themed action bar. I'll post an update with additional screenshots on that task is complete.
In the meantime, looking forward to your feedback/comments.