Use avrdude from user's PATH

avrdude is not specific to chipKIT, so it's cleaner to use whatever avrdude is
installed on the system.

Signed-off-by: Morten Hustveit <morten.hustveit@gmail.com>
Use ld scripts from mpide package

The ld scripts from the forked repository was just copies of these anyway.

Signed-off-by: Morten Hustveit <morten.hustveit@gmail.com>
Remove non-free startup files from mpide

No reason to include duplicates of files from the mpide distribution, which we
depend on anyway.

Signed-off-by: Morten Hustveit <morten.hustveit@gmail.com>
Port to UNO32 and start linker the right way

This commit also introduces a program that actually does something; alternating
the two onboard LEDs every 300ms.

Signed-off-by: Morten Hustveit <morten.hustveit@gmail.com>
Added some details to README.md

Signed-off-by: Morten Hustveit <morten.hustveit@gmail.com>