Revert "Added bc to the dependency list - not present on Ubuntu server 15.04"
Revert "Added bc to the dependency list - not present on Ubuntu server 15.04"

This reverts commit 5cebe656dbfc9dc895860ed70a4b32f910c293ff.

daytonpid/FireHawk,matt2005/raspbian-ua-netinst,beylsp/rpi-installer,firepick/FireHawk,FooDeas/raspberrypi-ua-netinst,dicer/raspbian-ua-netinst,cybercircuits/raspbian-ua-netinst,yodaaut/raspbian-ua-netinst,beylsp/rpi-installer,malsony/raspbian-ua-netinst,racing-tech/rrp-raspi-installer,racing-tech/rrp-raspi-installer,kolargol/raspbian-ua-netinst