move from hoe to jeweler and gets tests to run

* Adds modern Ruby version manager files
* Use Bundler for gem management
* Use Jeweler for gem dev management
* Keep test/test_files around for now
* add gitignore
Add Utf8 converter tests and get most to pass

Decoding Japanese still failing
Fixes UTF-8 decoding

Seems that it's better to use String#pack and force an encoding.
bump version and regen gemspec
fix properties2yaml by fixing redundant dependency

Somehow, java_properties ended up in the gemspec as a dependency.
add pkg to ignore