dxr: Add JSON serializer
dxr: Add JSON serializer

It will be used in the JSON-based interface to DXR data.

kleintom/dxr,nrc/dxr,erikrose/dxr,srenatus/dxr,bozzmob/dxr,jay-z007/dxr,nrc/dxr,jay-z007/dxr,gartung/dxr,jbradberry/dxr,srenatus/dxr,jay-z007/dxr,srenatus/dxr,gartung/dxr,gartung/dxr,jay-z007/dxr,KiemVM/Mozilla--dxr,pombredanne/dxr,bozzmob/dxr,kleintom/dxr,nrc/dxr,pelmers/dxr,pelmers/dxr,KiemVM/Mozilla--dxr,pombredanne/dxr,KiemVM/Mozilla--dxr,bozzmob/dxr,kleintom/dxr,jbradberry/dxr,bozzmob/dxr,pombredanne/dxr,bozzmob/dxr,pelmers/dxr,pelmers/dxr,pelmers/dxr,jbradberry/dxr,erikrose/dxr,jonasfj/dxr,gartung/dxr,KiemVM/Mozilla--dxr,erikrose/dxr,jbradberry/dxr,pelmers/dxr,jay-z007/dxr,jonasfj/dxr,jbradberry/dxr,KiemVM/Mozilla--dxr,nrc/dxr,pombredanne/dxr,pombredanne/dxr,kleintom/dxr,nrc/dxr,erikrose/dxr,srenatus/dxr,jonasfj/dxr,bozzmob/dxr,jonasfj/dxr,erikrose/dxr,pombredanne/dxr,gartung/dxr,srenatus/dxr,pelmers/dxr,jay-z007/dxr,KiemVM/Mozilla--dxr,bozzmob/dxr,kleintom/dxr,srenatus/dxr,kleintom/dxr,gartung/dxr,jbradberry/dxr,jonasfj/dxr,kleintom/dxr,jonasfj/dxr,jbradberry/dxr,nrc/dxr,gartung/dxr,jay-z007/dxr,pombredanne/dxr