New Sprite design

Several tweaks to the Sprite on the way to the flight unit. Added pins
and holes to interface to the deployer as well as a TCXO.
Tightened up spacing between tasc cells and ground pads
Adding radio install script for Ubuntu
Fixes to install script
Made corner hole 2.8 mm
Updated Gerbers and BOM for new Sprite order
Fixed silksreen on Sprite board
Updated Gerbers for Sprite
Updated install of RTL-SDR GNURadio Block to checkout 3.6 branch now that gr-osmosdr trunk has moved to 3.7.
Merge pull request #2 from WillGreen/master

Correction for gr-osmosdr trunk moving to GNURadio 3.7.
Merge remote-tracking branch 'upstream/master'