New macro: ACTION_BACKLIGHT_LEVEL(level)

To have full control of the backlight level.
Merge pull request #110 from xauser/master

Enhanced Backlight Support
Updates to keyboard layout switcher script
Fix compiler warning
Remove unused code
Lower delay for reboot by TEENSY_KEY
Reimplement FN21/FN22 - same Layer5/Layer6 but with permanent CTRL+ALT
Change PRODUCT_ID to custom value
Updates to CUB's layouts
Updates to CUB's layout - added media keys
Updates to CUB's layout - redefined mouse constants
Updates to CUB's layout
Change PollingIntervalMS to 10ms(Fix #114)
Return when ready check loop is timeouted(Fix #115)
Updates to CUB's layout - rearrange FN-keys
Added example how to handle custom keys
Added support for per-layer FN-translations
Merge remote-tracking branch 'tmk/master' into cub_layout
Add helper script to setup env for winavr toolchain used from cygwin
Add win32 teensy loader (for convenience)