Wrong Reactionary dependence

exports/atom.coffee requires package `reactionary` while atom only has `reactionary-atom-fork` as a dependence (https://github.com/atom/atom/blob/master/package.json#L53). Should require `reactionary-atom-fork` instead.

It's clear that `Reactionary` will soon be omitted from atom's module exports, but as long as fallbacks are provided, the `reactionary` package reference should be corrected. :)
Updated deprecation msg to reactionary-atom-fork
Add legacy panel classes to support old theme selectors

Signed-off-by: Max Brunsfeld <maxbrunsfeld@gmail.com>
Add legacy ‘from-top’ class at the view layer, not the model

This blends in to our approach with the other legacy panel classes.
Don’t apply ‘tool-panel’ class to modal panels
Fix workspace model spec now that legacy panel class is added in view
Merge pull request #4305 from atom/ns-add-legacy-panel-classes

Add legacy panel classes for theme support
:arrow_up: status-bar to remove redundant panel classes
:arrow_up: UI themes now that status-bar has no redundant panel classes

The UI themes now style both the legacy panel classes and the new panel
elements. Views converted to to the new panels API should remove their
legacy classes.
Remove deprecated requires from spec-helper
Fix misinformation in deprecation warning
:arrow_up: pathwatcher for deprecation warning fix
Don’t assume presence of unsubscribe method in SpacePen callRemoveHooks
:memo: Update restoreDefault to doc scopeSelector
Merge pull request #4286 from m0x72/patch-1

Wrong Reactionary dependence
Downgrade pathwatcher in an attempt to fix build
Use atom.notifications when there is a config file error
Trigger a notification when there is a keymap issue
:lipstick: on message
Add notifications package as a dependency