uses a fix cid for event tracking
fixes no end time utc bug, see https://heroku.newrelic.com/accounts/104609/applications/452642/traced_errors/619544616 for example
prevents a 500 if wetter.com API is down
see https://heroku.newrelic.com/accounts/104609/applications/452642/traced_errors/636894845
detects the studentenwerk's '-----------' entries as a delimiter and shows them as such.
also, even more checks for not existent or blank data
Merge pull request #55 from dirkschumacher/abendmensa

nicer view for the Abendmensa
Merge pull request #10 from dirkschumacher/master

couple of improvements and bug fixes