Issue #744: Added an advanced ExampleWizard (#749)

* Editing a region documented (issue #733).

* #725: Commented out features with not yet properly defined dependencies.

* #738: Fixed NPE.

* Fix installation instruction link

* improve the testplan

* append update site

* backup

* deleted content

* adjusted Layout

* Added GSON to Mars.target

* cleanup

* added slideshow feature

* fixed bug in slideshow

* created a simple json file service

* json file service is working now

* adjusted wizard init

* updated Mars.target for jgit and gson

* blub

* clone is working now

* impoved the advanced example wizard

* reverted format