Fixed "invalid multibyte escape: /[\x80-\xFF]/" error in Ruby 2.0
Added .gemspec so the gem could be used directly from Git
OpenSSL::Digest::Digest is deprecated in favour of OpenSSL::Digest (discouraged to use since 1.8 - https://github.com/ruby/ruby/blob/ruby_1_8_7/ext/openssl/lib/openssl/digest.rb#L51)
fix for Rails 4.1.0+
Merge remote-tracking branch 'upstream/master'