Inline tag

[SimonLab]

Experiment with content editable
linked to #221 (comment)

At the moment just add span with color red on the "tag" text content:

[nelsonic]

This will be an awesome feature once we get the basic tagging working.
For now we can simply parse all the words in the item.text <textarea>
and include them as suggestions when the person starts typing in the tags <input>.
That shouldn't require too much code.
But please have a look at: #221 (comment)