Allows searching for the keywords in Ubuntu dash.
Fixes adobe/brackets#8342, also adds a few more tags (other than 'editor'). Can easily be expanded to more tags, currently includes (not case sensitive) Editor, Text, Web, Development.
Seems to work for all the tags, although sometimes the search in Ubuntu's Unity dash seems to break. This breaking isn't something that Brackets is responsible for, as far as I can tell (no editors show up, and with this line removed, they still don't show up in some cases). These cases appear to be random, no reason that I could find.
Add keywords to improve search
Thanks @Mark-Simulacrum. Looks good to me.