In Tool, create a URL for GitHub wikipage's anchor when catching an throwable exception.
Create gitHub exception wiki link in RichXHandler. Use t.getClass.getName to get its class name.
Again, create gitHub exception wiki link in RichXHandler, as its method.
Bug fix: in the tests createXUrl should take a Throwable, not a classOf[Throwable]
Move class string constants from XHandler to XHandlerTest.
Merge pull request #405 from reconditesea/klin_wiki_link

Generate wiki link in Tool.