Moved GADM stuff to inst/extras, as it is likely not needed
Moved extra vignette stuff to inst/extras/
Combined Helsinki functionsin to new get_Helsinki_district_boundaries()
Small upates
Removed GetStaticmapGoogleMaps(), as it is done in package ggmap
Combined geocoding stuff into new get_geocode() function
Small updates
Moved theme_map to visualization.R
Implemented geocoding from OKF's API, implemented Google geocoding with json instead of XML
Fixed parameter documentation in helsinki_maps.R