Initial checkin

app/models/battery_change.py

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+from app.extensions import db, ma
+
+class BatteryChange(db.Model):
+    order = db.Column(db.Integer)
+    shift_id = db.Column(db.Integer, db.ForeignKey('shift.id'), primary_key=True, nullable=False)
+    vehicle_id = db.Column(db.Integer, db.ForeignKey('vehicle.id'), primary_key=True, nullable=False)
+    completed = db.Column(db.Boolean, nullable=False, default=False)
+    vehicle = db.relationship('Vehicle', backref='change_to_vehicle')
+
+class BatteryChangeSchema(ma.Schema):
+    vehicle = ma.Nested('VehicleSchema', only=['license_plate', 'battery_level', 
+                                               'in_use', 'model', 'location_lat', 
+                                               'location_long', 'id'], many=False)
+    class Meta:
+        model=BatteryChange
+        fields = ('shift_id', 'vehicle_id', 'completed', 'vehicle')