rename weblog parser config file

[sidlo]

The config file of the weblog parser extension is called config.xml. It should be renamed to a more meaningful name, eg. weblog-config.xml, because in a longneck app there is no way telling to which extension config.xml belongs to.

[lukacsg]

I changed it in the longneck-weblog extension but it has to adjust another repository to work with this change: weblog-demo. Than find out if this's working.

[lukacsg]

I adjust this in weblog-demo but it has to try out and revise the document (example in getting start in webpage) and the downloads version too. Than longneck-weblog 1.6.3 deploy to our repository?

[sidlo]

I renamed the config files affected in weblog-demo, and also added some documentation on the extension to the web site. Github repo is up-to-date, but we have still have to deploy to the Maven repo.