implemented search through OSM nominatim
also show search results on map
config: adjusted maxZoom (15 seems to work for OSM, haven't tested other) and commented in 'Pools' feed (so at least the first search result set has icons for now)
restrict search results to current map extent. also improved featureBoxItem appearance by truncating long titles
documentation, removed 'bounded=1' from GeoFeeds.Search, optimized conversion between nominatim and 'title'/'description' properties for Features returned from Search
Merge remote-tracking branch 'nilclass/feature/search' into develop

Conflicts:
	app/geofeeds/device.js
	app/views/featureTab.js