Upgrade tabs and themes

Scrolls when lots of tabs
Upload AtomSetup.exe on Windows
Add missing )
Upload RELEASES and .nupkg files
Return assets
Create windows installer on CI
Merge pull request #4191 from atom/ks-upload-windows-installer

Upload Squirrel Windows assets to releases
Remove outdated markdown task
Assign buildDir at top of function
Fix resetting scoped config defaults

It would write an empty object for the parent key when there were no
other objects in the parent key.

Closes #4175
Merge pull request #4194 from atom/bo-fix-scoped-config-default

Fix resetting scoped config defaults
Update linux.md

Update `git fetch` command to include the prune flag which will remove remote branches that no longer exist.
:arrow_up: language-c@0.31
Merge pull request #4209 from stramel/patch-1

Update linux.md
Respect the editor.autoIndent option when pasting

Signed-off-by: Nathan Sobo <nathan@github.com>
Don't auto-indent current line when pasting after non-whitespace characters

Signed-off-by: Nathan Sobo <nathan@github.com>
Base suggested indent level on previous non-blank row

Signed-off-by: Nathan Sobo <nathan@github.com>