Implementation of UrlBuilder and UrlBuilderFactory.
Merge pull request #31 from evangelion1204/UrlBuilder

Implementation of UrlBuilder
Simplifying test suite bootstrap by using "autoload-dev" for tests
Changing way for Mink 2.0 version detection

1. take care of NodeElement calling `getDriver` from constructor (in Mink)
Merge pull request #45 from aik099/45-update-mink-version-detecting-code

Update Mink version detecting code