Merge pull request #102 from matthesrieke/dev

adjust thumbnail urls for AGOL maps
Merge branch 'dev' of https://github.com/enviroCar/enviroCar-www into dev
Merge pull request #108 from enviroCar/master

Update URL of server
Updated texts regarding app download.
Added missing word
Merge pull request #111 from enviroCar/dev

Merge branch 'dev'