implement triangle, square and blank modi for Turtle. Fixed Circletest.
fix triangle
pow function (but types with are not right, it thinks some numbers are floats) and map function almost works
Merge branch 'master' of github.com:Dandandan/skulpt into danddan-merge

Conflicts:
	dist/builtin.js
	dist/skulpt.js
Restore Sk.tg.fadeOnExit

This works as long as the turtle module is used in the context of skulpt.  If you try to use the turtle graphics implementation as a standalone javascript turtle then you will get this error.  But I'm willing to live with that since the turtle module is supposed to be used in conjunction with Skulpt.
Remove commented out version of map in favor of the map merged in #83
update sample turtle programs so they all include jQuery and they all run.  Demonstrate use of 'square' shape.
Rebuilt dist.