* grep -> $(GREP)
Some UNIXy systems (FreeBSD for example) don't use GNU grep by default.
Allow the user to specify which grep implementation to use so that
GNU grep can be specified.
* Allow using versioned avr-gcc command
Don't hardcode "avr-gcc", and allow strings such as "avr-gcc8", or
"avr-gcc-7.3.0" to match checks for "avr-gcc".
* pull fuse settings for bootloader jump
* fix 32a chips
* make automatic bootloader selection optional
* quantify bootloaders
* fixs #164, speeds up dfu reset
* fix for chips w/o usb
* missing an n
* fix bootloader sizes, use words for addresses
* fix bmini, pearl, and [[ issue, make things quiet
* ignore avr errors on arm for now
* update settings for the light
* document bootloader stuff
* add bootloader title
