* add sagan instance fetch function
* add sagan discovery
* add sagan poller
* add sagan graphs
* add graph sources
* add sagan to apps page
* remove alert
* more app graph work
* polling fix
* re-order keys and add alert key
* correct field key usage
* add alert and fix a missing unit
* more unit fixes
* add alert status
* add alert rules for sagan
* fix a missing : after S while I am here in the json stat tool helper... also add tests
* now add the tests
* add docs
* point php-cs-fixer at two files
* remove-unneeded sagan instance fetch function
* convert to use app_data
* style fix
* apply bennet-esyoil's suggestions here as well
* update for the new app model
* convert poller to the new method
* convert the sagan device app page
* convert sagan
* doc cleanup
