using uglify now to concat js files (in dev mode not compressed)
- new targets in grunt file
removed unnecessary inline png from map.svg to speed the page
add map-with-png.svg to have access to original
add generation of css file to satisfy testing needs in travis
try to fix the again occurring timeout errors in mocha on travis
try to fix the again occurring timeout errors in mocha on travis
Merge pull request #728 from leider/master

transfer less bytes over network to improve the experience of the platform
updated 'credits' to reflect the use of uglify