Release version 0.2.0

frontent and backand combined to one express server. Map displayed
as grid of images. Backand can now Crawl images at any zoom level.
Add OpenCV stitcher

Added a pictures stitcher based on the OpenCV example
stitcher_detailed.cpp; a small cpp app taking multiple images to
combine into one panorama.
Sadly this Script does not scale very vell, e.g: for a 4x2 it takes
about 1 minuite to compile for a 3x4 probably 4. The other problem
is that the borders of the images confuses the algorithm.
Recursive Crawler

First implementation of the recursive crawler function. Some miner
issues are still present.