map-click-handler.js: don't catch events on transparent space
map-click-handler.js: use plane location as anchor
map-click-handler.js: move info creation into separate methods
map-click-handler.js: Better visibility management
controllers.airspace: add airspace controller for ajaxy airspace queries
map-click-handler: increase space between click location and infobox
map-click-handler: stop animations on re-open infobox
map-click-handler: show airspace info
Merge pull request #20 from TobiasLohner/airspace_info

Airspace info
model/tracking: Accept numeric values in delay_filter()
model/tracking: Added documentation to delay_filter()
airspace: update airspace sources
import_airspaces: ignore airspaces above FL 200 instead of FL 100