Add LPTMR definitions
Add FTM channel bit definitions
Allow custom USB enumeration.
This patch simply checks if NUM_ENDPOINTS is defined, and will bypass the
built-in USB descriptor, device and memory code, and allows a custom setting.
This bug does not affect the IDE unless someone adds the custom option to
the boards.txt file, and provides replacement code in a library or sketch.
It can also be used to turn off USB by providing no replacements, while
allowing speeds >= 20MHz.
Merge pull request #25 from xxxajk/master

Allow custom USB enumeration.
Add emulation for AVR util/parity.h
Use RAM-based interrupt vector table
Actually use RAM vector table!
Use parens around macros in mk20dx128.h
Add DMAChannel (work in progress)
Use parens around more macros in mk20dx128.h
DMAChannel stuff (still work in progress)
Merge pull request #1 from PaulStoffregen/master

resync
Add missing FTM bit field definitions
DMAChannel stuff (even work in progress)
Merge pull request #2 from PaulStoffregen/master

resync
DMAChannel stuff (work in progess - scatter/gather)
DMAChannel stuff (getting close to final)
Merge pull request #3 from PaulStoffregen/master

resync
DMAChannel destination needs volatile
Merge pull request #4 from PaulStoffregen/master

resync