New developer guide available

Dear all,

I have finished the [new developer guide](http://docs.opengeosys.org/docs/devguide). I like to ask to have a look at it before I will announce on mailing list. You don't need to read it from start to end but if you have some general remarks please let me know.

There is also short intro on [how to use the guide](http://docs.opengeosys.org/docs).

The [web system](http://buildwithcraft.com) I used is super flexible and it would be no problem to integrate other future guides (e.g. a user guide) into it. The documentation is written in the same Markdown as we use here on GitHub. If someone is interested in how it works I can also provide a login.