Update link tests
Update tester function
Fix selection change detection. Add an error wrapper.
Bold errors
Fix empty external links
White space
Make link a toggle button
Fix names
Encode URI subject in src/plugins/link/link-type-email.js
Fix empty selection returning applied in src/dependencies/rangy/rangy-applier.js
Update src/plugins/link/link-remove.js
Fix template in  src/plugins/tag-tree/tag-tree.js
Wrap error
Fix tag menu
Merge remote-tracking branch 'origin/experimental' into experimental
Add toggle button
Add toggle button
Add toggle button
Update clear formatting tests
Update clean tools