Update to Java 8

The first release of Java 8 has no update version. This breaks the
existing pattern for update versions. Since the update_version parameter
has been removed, this commit will break existing usage, when the
parameter is explicitly set by the user.
Upgrade JCE JARs

Java 8 requires a new version of JCE.
Update README for removed parameter
Fix puppet-lint error

After removing the parameter `update_version`, the usage of double
quotes is no longer necessary.