Adapt alerts as a link gimmick with new api
Allow additional Text in singleLineGimmicks to be read in
Add check for Specrunner/unittest env
Add (crrently failing) test for singeline "oneliners"
Improve Wiki class

* Make Wiki operate on a custom DOM node
* Seperate initialization and running of the gimmicks into
  their respective stages
Move link processing into own class LinkRewriter