* add 'mavrdude' target into tmk_core/avr.mk
I made it a little convenient when writing the same binary to multiple Pro Micro.
* rename target name 'mavrdude' to 'avrdude-loop'
* modify docs/flashing.md about avrdude-loop
* mdify docs/flashing.md again
* modifi docs/flashing.md 3rd
* 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