adds Webhook::Configuration class and allows for configuration of the user agent
Update README.md
adjust code climate badge URL
Merge pull request #2 from AbleTech/G5-configuration

Configuration enhancement from G5
add support for Ruby 2.0.0
Merge pull request #3 from AbleTech/feature/add_support_for_ruby2

add support for Ruby 2.0.0
update version numbers for 0.1.0 release
Merge branch 'release/v0.1.0'