RUBY-698 Passing opts down to deserialization in java ext
RUBY-698 Adding back in regex tests for jruby
RUBY-698 De/serialization support for BSONRegex in java extension
RUBY-698 Use option constants from BSON:Regex class in java extension
RUBY-698 Set opts explicitly on RubyBSONCallback instead of changing constructor
RUBY-698 Refactor to not use extra variable in java ext deserialization