Detect invalid X509 certificates.
Refactor X509 certificate validation and debugging.
Use stronger wording in warn message
Document verifying X509 certificates, methods on generating certificates
fix typo
Troubleshooting tips for trusted certificate warnings.
Remove SO link from comments, link to docs later
Merge branch 'master' into mcquin/Issue-1944

Conflicts:
	DOC_CHANGES.md
Update for x509 property verification during knife ssl check
Merge pull request #2036 from opscode/mcquin/Issue-1944

Verify X509 properties of trusted certificates