* use uiSettingsClient instead of angular config service
* replace timefilter service with singleton
* remove all other uses of timefilter service, get timefilter singleton working
* remove Private from brush event
* globalState
* fix timefilter jest test
* clean up rebase artifacts
* lint errors
* another lint error
* fix broken functional test _shared_links
* fix broken mocha test doc.js
* fix service load order breaking status page
* remove Provider from change_time_filter
* another round of mocha test updates
* convert create_brush_handler test to jest
* fix kbnGlobalTimepicker toogle mocha test
* remove _root_search_source - removed in another PR and somehow I added it back during rebase
* better comments around Object.assign and proper js-docs format
* use so listerners get cleaned up when scope is destroyed
* listen to correct timefilter update event
* update APM to use timefilter singleton
* update angular scope when timefilter changes
* fix APM jest test
* add listenAndDigestAsync to listen.js
* fix apm breadcrumbs jest test
* move diffTime and diffInterval into timefilter
* pass mode to updateFilter to resolve functional test failure
* call registerTimefilterWithGlobalState from APM application
* remove rootScope from kbn_global_timepicker
* use to subscribe to timefilter in cases where results need to happen in digest async
* spalger review changes
* ensure monitoring timefilter callbacks are executed inside evalAsync
* remove unneeded evalAsync calls around setTime
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