[Snek] Snek version 1.4 released

[Keith Packard]

 * LEGO EV3 port.
   This port, done by Mikhail Gusarov, includes custom functions for
   the motors and sensors.

 * HiFive1 Rev B port.
   This uses a bunch of code from for all of the core and device support.
 
 * Lots of bugs fixed in string interpolation.

 * Lessons using LEGO with Snekboard
   There are four lessons that show you how to build a simple robot
   with step-by-step construction information, and then explore
   programming on a Snekboard.

 * Improved time.sleep precision. time.sleep is now accurate to the
   resolution of the timer. On a Duemilanove, that's
   4µs. time.monotonic still returns a float, so the longer
   the board has been running, the lower the precision...

 * Support for optiboot in Duemilanove code. Once you've installed
   optiboot on your Duemilanove, you can install Snek using that over
   the USB port, instead of needing an ISP.

-- 
-keith
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