Merge pull request #4 from johankok/master

Some other minor updates. Thanks @johankok
Bumped gem version
Remove Gemfile.lock from .gitignore
Add Gemfile.lock
Add warning to Readme about open issue in httparty
Styling
Update README.rdoc
Add CI script for Jenkins, ignore vendor/ directory
Do not ignore .rvmrc, need it for Jenkins
Fix build script
Make sure the build script copies the sisow.yml file in place
Update Readme (test to see if Jenkins starts a build)
Fix build script
Use old style RCOV formatting on Jenkins
Add transaction_id to Sisow::Payment class
Bump gem version and add transaction_id to README
Let callback.validate! return true if the callback is valid instead of only raising an error if it is not valid. Bump gem version to 0.9.5
Udpate Gemfile.lock
Fixes an issue where, in test mode, the payment URL for Bancontact/Mistercash and Sofort would point to a production endpoint instead of to a test page
Bump gem version to 0.9.9 - closing in on the 1.0 release!