Added a spinner component based on
http://www.virtuosoft.eu/code/bootstrap-touchspin/
Merge branch 'master' of https://github.com/danjee/wicket-bootstrap.git

Conflicts:
	bootstrap-extensions/src/main/java/de/agilecoders/wicket/extensions/markup/html/bootstrap/form/spinner/Spinner.java
	bootstrap-extensions/src/main/java/de/agilecoders/wicket/extensions/markup/html/bootstrap/form/spinner/SpinnerConfig.java