add vendor/ruby and .bundle to .gitignore
use replace jeweler with bundler to manage gem
add test-unit as a development dependency
Merge pull request #15 from dwilkie/use_bundler_to_manage_gem

replace jeweler with bundler to manage gem
Merge pull request #13 from dwilkie/gitignore

add vendor/ruby and .bundle to .gitignore
Merge remote-tracking branch 'origin/master' into ruby_19