Fix client_id/client_secret string requirements #171
Merged
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The OAuth2 spec allows these to be zero or more visual ASCII characters.
https://tools.ietf.org/html/draft-ietf-oauth-v2-31#appendix-A.1
This PR includes two changes. The first is to explicitly allow empty strings. (Joi requires this to be explicit). The second commit restricts the character set to the range given in the spec, which is all visual non-control ASCII characters.
Fixes #170