New Project: graphhopper #83

* entry in js/data.json: introduction text and license info from https://github.com/graphhopper/graphhopper
* ~~logo combines (comparatively) high-res image header.png (cut out just the letter g) and the green background of favicon.ico, both from graphhopper.com, used lanczos interpolation and +70/127 contrast (gimp) (color,alpha) to enlarge it to the minimum acceptable size of 128×128~~

(it's still done the old way on my own fork because the commit was from the 6th March when the base version didn't match (now it can be merged, therefore this pull request) )

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Edit:
* ~~logo uses header.png (cut out just the letter g), fit into the relative layout of favicon.ico, both from graphhopper.com, used lanczos interpolation and +70/127 contrast (gimp) (color,alpha) to enlarge it to the minimum acceptable size of 128×128~~
* deletes entry in js/data.json and logo of OpenRouteService

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Edit:
* logo uses http://graphhopper.com/maps/img/icon.png , resized to 128×128 and put on 160×160 canvas