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

fixes #16288 - moves ace editor to webpack.

I've tried to limit changes to minimum, besides fixing lint errors i've:
- moved to brace package (as its compatable with br and webpack).
- added ERB as a syntex highlight.

Fixes #18906 - empty tooltip on notification

Fixes #18901 - fix bottom notification dropdown

fixes #18476 - users have ssh keys