goauth2: add more sites to the list of badly behaved OAuth2 providers
goauth2: add more sites to the list of badly behaved OAuth2 providers

Fixes issue 39.
Fixes issue 40.

LGTM=bradfitz
R=bradfitz
CC=golang-codereviews
https://codereview.appspot.com/139740043

djacobow/goauth2,treetopllc/goauth2,udhos/goauth2,happydpc/goauth2,stanwu/goauth2,avisri/goauth2,smagic39/goauth2,imrickrick/goauth2,badu/goauth2,lvzhihao/goauth2,desireebisco/goauth2,aquarat/goauth2,hiteshjoshi/goauth2,pkieltyka/goauth2,MrDangerous/goauth2,epelc/goauth2,skyeunknown084/goauth2,jeisenberg/goauth2,mattga/goauth2,combucha/goauth2,odeke-em/goauth2