fgm/go__socialnetwork: A fork of the code in the Go web services book @ 6b151121d57bcb0fbc136002a5b17322edf7e1f1

Frederic G. MARAND 6b151121d5 Ch2 pp82-83: tagging structs for YAML.		8 lat temu
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ex1	51e716d840 Ch2 pp79-80 tagging structs for JSON	8 lat temu
ex2	5652d02c98 Ch2 p81: tagging structs for XML.	8 lat temu
ex3	6b151121d5 Ch2 pp82-83: tagging structs for YAML.	8 lat temu