This commit makes it possible to customize and display automatically form
inputs with this kind of hashbang parameters:
https://start.spring.io/#!language=groovy&name=Groovy%20Sample
type, groupId, artifactId, name, description, packageName,
packaging, javaVersion and language parameters are supported.
Closes gh-107
Since Htmlunit does not provide a complete support for Javascript, smoke
tests are migrated to Gab (i.e. using Selenium and an actual browser).
This present a major challenge: it is not easy to assert the content of
a file that the browser downloads when it submits a form. First, the
browser should be configured to download the file directly instead of
opening a (native) pop-up asking the users where to download it. Then,
the tests should be aware of the location of the file in order to assert
it.
Hopefully, Firefox can be configured to achieve this goal.
Closes gh-75
