keep one instance of StrongTrustManager around
keep one instance of factory; expose notify pref
adds BasicConstrains exists and TRUE checking
minor changes in log output
added support for KeyUsage verification
Merge branch 'dev'
removing prototype pinning support (for now)

will investigate using moxie's new libpinning library
verify all instances of same DN/CN in chain

check entire chain for multiple instances of CN/DN
to ensure they are allowed to be issuer/CA/signer
Merge pull request #5 from n8fr8/master

critical fixes to SSL cert verification in StrongTrustManager