Enhancing jsonify possibilities

[Viale-Stephane]

added possibility to jsonify schema with virtual members.
added possibility to handle N number of nested object such as :
{
address: {
postal_code: string,
position: {
lat: number,
long: number,
}
}
.
.
.
}

[coveralls]

Coverage decreased (-1.6%) to 98.387% when pulling 47a5dec on Viale-Stephane:master into 4d536bd on vstirbu:master.