fgm/waiig15: My version of the Writing an Interpreter in Go 1.5 code. @ 55730af15e7792441f0c17391387da23db7aefcf

Frederic G. MARAND 0dfd853a8a §2.6 Parsint int literals. Makefile. One pass of goimports.		6 lat temu
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lexer.go	3f83d07e0a §2.5 parsing return statements. One pass of golint cleanup.	6 lat temu
lexer_test.go	0dfd853a8a §2.6 Parsint int literals. Makefile. One pass of goimports.	6 lat temu