add json-writer and constants
import jackson
make JsonWriter write vehicles
make JsonWriter write vehicleTypes
add JsonReader
add JsonReader
Merge branch 'master' into json
add jsonReader
Merge branch 'master' into json
json io stuff
Merge branch 'master' into json
add json stuff
add json stuff
add json stuff
add json stuff
add json stuff
add json stuff
add json stuff
add json stuff
Merge branch 'master' into json