Added slightely different logo
levels: fixed some navigation bugs
levels: fixed graph range label typo
levels: fixed #16, monitoring is now disabled by default
news: added helper item for recording

... and removed delete card helper card, should be clear due to delete
animation
levels: added pull to refresh to StationActivity
levels: added CombinedSourceLoader for loading current and recorded data
pegelonline: add PegelOnlineUtils for parsing dates
levels: added TimestampLoader
levels:  slightly updated pull to refresh colors
levels: added pull to refresh to RiverGraphActivity