Make button for adding link accessible - WIP

Fixes #57
Make button for adding link accessible

Fixes #57
Add basic ARIA support for toolbars and buttons

Fixes #58
Improves ARIA support of the toolbars and buttons

Fixes #58
Update API for ver. 0.2.2
Release v 0.2.3
Add possibility to create release with non-minimized files

Fixes #61