Fixes #18438 - control notifications polling

Fixes #19502 - fix react warnings

fixes #19479, #10587, #19500 - two pane notifications are visible

- notification is now inside the content div, allowing two-pane server
responses to include it.
- refactored all notifications to use notification helpers (notice,
warning and error) instead of direct flash manipulation...

fixes #14178 - Introduce patternfly toast notifications

Fixes #18957,#18193,#18678,#18853 - notifications redux

Refactored notifications to work with redux, fixed
several UI related bugs, added tests.
flux is now unused, this is based on @gailsteiger's
previous work.

fixes #14178 - introduce react patternfly toasts

fixes #14178 - introduce patternfly toast notifications

- replaces old jnoitfy with react implementation.
- Adds a notification store to handle events from
rails flash + legacy javascript Notice function and expose
an Action API to add notifications.

fixes #19192 - adds mark all as read notification action

This implements missing feature from patternfly ( see http://www.patternfly.org/pattern-library/communication/notification-drawer/#/code/angular)

Fixes #18957,#18193,#18678,#18853 - notifications redux

Refactored notifications to work with redux, fixed
several UI related bugs, added tests.
flux is now unused, this is based on @gailsteiger's
previous work.

fixes #12419 - template preview host has typeahead