add city table and relative APIs
forget adding...
create test city
show events of clicked city only
change city name to fit twgeojson.json
"市" 這個字是不是有兩種編碼阿？
Merge pull request #59 from yglin/city_layer

fix #57, add schema and api for city, only show events of clicked city
center the map on the clicked marker
httpGet return json, not txt
hide only countLayout while zoom in
fix layer show/hide behavior, show events of clicked city while zoom change and click
show tooltip of city outside the map
set setLayerVisibility on moveend to fix showinng error while switch city on same zoom level
set default view and zoom of map
Merge pull request #63 from yglin/mapview

add map view