modified rack version
refactored metrics and observations (adding sources)
refactored SourceData adding cache layer
extracted crop_time to another file
removed source from check_queues.yml
refactored manager and worker to new check_json without start_time
refactored DataAnalysis module
deleted former bootstrapping file
corrected some bugs in DataAnalysis
updated check task and tweaked some details so that a single check works
added divergence calculation
changed iterations to 10 to improve performance
pretty printing of ad-hoc check task
downgrading activeadmin to avoid problem
removed data from observation
adding sources CRUD
refactored metrics CRUD
refactored maps VIEW
refactored observations CRUD
fixed bug accessing chack period