Changed default EPIPHANY_PREFIX from "e-" to "epiphany-elf-". Removed explicit CROSS_COMPILE variable from the Make command so that the environment variable will be used. Tabified the script to remove mixed uses of TAB characters and whitespace.
Merge remote-tracking branch 'origin/bcxcube-scripts-update' into release_stage

Merge from origin/bcxcube-scripts-update to release_stage