0.9.14

• upgrade to using BC 1.54 as default (all versions >= 1.49 are supported)
  for Bouncy-Castle release notes see http://bouncycastle.org/releasenotes.html
• basic support for prompting for PEM password (working for RSA/DSA priv.key)
• avoid NPE due version field in X509Cert - make sure it's treated as 0 (#78)
  and fix settting ceritificate.serial = number
• default WairReadable/Writable backtraces to JRuby's -Xerrno.backtrace
• use hardcoded jks type for loading cacerts - for Java 9 compatibility (#79)