Added test file for test feature.
Added dummy items in the settings to demonstrate different UI elements.

Added class PretestCommitPreCheckout that demonstrates two different hooks that occur just before the build.
Added helptext to checkbox entry
Added textField to global configuration
Added select box
Added jellies for PretestCommitPreCheckout.
Added validation button
Fixed whitespace in HelloWorldBuilder.java
Merged feature/plugin_config_footprint into develop