rename project to sbjson

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Submitting on behalf of @kevinlawler:

this would make it much easier to find. the current name is generic and hard to find. people refer to your project as sbjson. i used your initial version a couple years ago. i had trouble getting to it this time. had I given up my search i might have defaulted to a less useful library.

if you have already spent significant time considering this proposal then you may wish to ignore this. i haven't spent significant time considering it. it does seem like something an insider might overlook, plus modesty may play a role (it shouldn't, people call it sbjson so call it sbjson please)

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I think you are right. I have resisted a name change for too long. A 3.0 release might be the time to do it.

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Fixed in master. Github rename might come later...