Use Gem::Package.build(spec) instead of Gem::Builder.new(spec).build
add builder to Gemfile
fix travis test
fix add author to spec using git commit
set git config to fix spec
set git config to fix spec
set git config to fix spec
Merge remote-tracking branch 'emilsoman/rubygems-2.0.0-compatibility' into feature/test

Conflicts:
	lib/jeweler/commands/build_gem.rb
enable bundle install on ruby-2.0.0
support ruby-2.0.0
update yard
support rubygems 1.x
Merge pull request #238 from muratayusuke/feature/support_ruby2.0.0

Feature/support ruby2.0.0