Bulding and installing Escher

Escher requires the Go language toolchain to be installed first. Fetching, building and installing Escher can then be accomplished with one command:

	% go get github.com/gocircuit/escher/escher

To check that installation succeeded, run

	% ESCHER=github.com/gocircuit/escher/src escher test.All
	+ Test basic.TestFork (ok)
	+ Test basic.TestFunc (ok)
	+ Test text.TestForm (ok)
	+ Test yield.TestValues (ok)
	…

Note that the environment ESCHER must point to the src subdirectory of the main Escher repo on your host.