Made changes to work with Ruby 2
Update blitz.gemspec to loosen dependencies
Replaced 3rd party gem Hexy with Hexdump due to errors in Ruby 2
Changed AssertionFailedError to work with Rspec
Changed Gemfile to point to secure Rubygems source
Updated Rakefile to use RDoc/task
Fixed RUBY_VERSION check to include 2
Set version to 0.1.30