Add multiregion tests for MoveTo.

Close limetext#112.
Amend some tests so they pass.

I'm not sure if they're valid failure cases or not.
@quarnster?
Revert "Amend some tests so they pass."

This reverts commit b40994ce0062594715367643dc42471513f7718b.
Improve readability and add some MoveTo tests.
Add MoveTo tests with selections.
Add support for file parameter in termbox
Fix the formatting.
Fix formatting in insdel_test.
updates readme with correct screenshot date alt-text
Add LoadTheme tests.
Merge pull request #348 from erbridge/fix_formatting

Fix formatting in insdel_test
Merge pull request #347 from Joushou/filefromcli

Add support for file parameter in termbox
Add a method to get the keybindings from the editor.
Add some editor tests.
Skip Editor.Keybindings in the python api generation.
Merge pull request #349 from bmathews/screenshot

updates readme with correct screenshot date alt-text
Merge pull request #351 from erbridge/editor_test

More editor tests
Merge pull request #341 from erbridge/move_test

Multiregion move to tests
Merge pull request #350 from erbridge/theme_test

Add LoadTheme tests
frontend/qml: QML triggered commands are executed in a new goroutine

Fixes #337