Free text and'd search

-- do search if term is chosen by enter key

Old Notes
Added free text search
--fixed bugs mentioned by @DavidEBest and removed ui.json file.
-- searches descriptions and titles of projects and tasks, all terms are and'd in this search
-- also free text searches tag names, all terms are or'd in this search
-- still uses the select2 autocomplete which shows tags as you type, but the tag icon is removed if an existing tag is selected and it is effectively treated like a free text search

Replaces #429 & #426

Addresses #341 .