Better default keybinding for Remove Word Right

So the default for `Remove Word Left` was `Ctrl-Backspace`, which makes a lot of sense: `Backspace`, `Left`, and `Right` keys all operate one letter at a time, and `Ctrl` makes them operate one word at a time. But the default for `Remove Word Right` was `Alt+D`, which didn't make any sense to me, because it seemed highly inconsistent, and also my window manager (Ubuntu Unity) gets confused by the alt key from time to time. 

So, I propose that `Ctrl-Delete` is a much better shortcut, because it makes the `Ctrl` key consistently delete forward by words just like it makes the `Backspace` key delete backwards by words.

If you disagree, I guess I'll just keep this to my personal config, but I felt strongly about this consistency so I wanted to share ;-)
Keep Alt-D for macs.
Clean up sort_selection.js
Add a toggle for trimEmptyLines preference.
Fixes #109 by adding command to use local folder instead.

Zed now has two extra commands: `Configuration:Store in Local Folder`,
which lets the user select a local folder to store Zed's configuration
project in. and `Configuration:Store in Google Drive` to switch back to
the default configuration.
Merge branch 'master' of github.com:zedapp/zed
Merge pull request #117 from robru/cleanup_sort_selection

Clean up sort_selection.js
Merge pull request #112 from robru/patch-1

Better default keybinding for Remove Word Right
Merge pull request #118 from robru/patch-2

Add a toggle for trimEmptyLines preference.
Version bump and changelog update
Merge branch 'master' of github.com:zedapp/zed
Update indexes
Fix Makefile filenames.

According to the documentation:

https://www.gnu.org/software/make/manual/html_node/Makefile-Names.html
Merge pull request #120 from robru/patch-3

Fix Makefile filenames.
Fixes #123 by adding "internal" flag to commands (both core and custom
sandbox commands), also adds `Window:Close` command.
Extremely common window-closing shortcut.
Merge pull request #124 from robru/patch-4

Extremely common window-closing shortcut.