added a chapter components for symfony, OpenLayers, ..., document needs review , added to the index of thebook.
new image from presentations with the different components - used in components.rst
Merge branch 'master' of github.com:mapbender/mapbender-documentation
new chapter How to create a Bundle

Took the documentation from wiki.mapbender3.org from Christian and transfered it to rst syntax and added some information

Added it to toctree bundles and development

Document needs review