Cleanup old doc/*; remove CHANGES.SSLeay

Removed CHANGES.SSLeay

Udpate README to be current.

Updated fignerprints.txt to list only current release signers and
to explain that is what it's used for.

Removed the following:
	c-indentation.el -- doesn't go with our coding style
	openssl-shared.txt -- old info about shared library aides
	openssl.txt -- old info about X509v3 extension support/syntax
	ssleay.txt -- old info about OpenSSL's predecessor, back when
		programmers coded on COBOL sheets by candlelight

Reviewed-by: Richard Levitte <levitte@openssl.org>