fix layout on Nexus4

Nexus 4 is 768x1280 on a 4.7" screen.
The Feedback / Help menu does not look good at all on this device.

Change the way buttons are created: all are relative to qanda or parent
Merge pull request #92 from eddyp/fixnexus4layout

fix layout on Nexus4
Merge pull request #91 from kerryland/master

Variable Speed Support added
Beta Speed stuff, fix faq/help page, add keep_screen_on preferences
updated copyright to include reference to PrestoClient
Variable speed config changes now dynamic. Added links to Google play (that don't quite work!)