fgm/waiig15: My version of the Writing an Interpreter in Go 1.5 code.

Frederic G. MARAND c262d2bded §2.8 If/else expressions.		%!s(int64=5) %!d(string=hai) anos
..
REPL.xml	c7b6a1082e Adjust imports for actual repo URL.	%!s(int64=5) %!d(string=hai) anos
Test_All.xml	c262d2bded §2.8 If/else expressions.	%!s(int64=5) %!d(string=hai) anos