Oauth1 server support, RSA-SHA1 signature method and important bug fixes#4

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hoylen wants to merge 4 commits intonbspou:fork/nbspoufrom hoylen:oauth1-server-support

+4,487-288

Commits on Jul 4, 2019

Added support for implementing OAuth1 servers.
hoylen
committed

Commits on Jul 7, 2019

Implemented RSA-SHA1 signature method.
hoylen
committed

Commits on Jul 9, 2019