updated for foldingtext dev
Added date when applying @done tag and keymaps

- Command-D toggles @done
- Command-T toggles @today
added date/time plugin with commands to insert current date/time
use medium date formatting instead
updated plugins for latest API changes.
added specs for plugins
wiki link example
word count alternative technique example
editor moved from "core" to "editor"
replaceSelection defaults to end. Use 'around' to get old default behavior
don't conflict with installed "done" command
updated to latest
delete plugin that was just used for tests
add display of count