More complex query using intersections and unions

[ksnabb]

Build a query engine using json and GET method to be used against mongodb
The query will be a json array representing the sub queries that need to be unified and inside every query the parameters will be used for the interesect

EG: http://......?query=[ { prop1 = 3 , prop2 = 4 }, { other_prop__in: [ 2, 3, 4, 5 ], other_prop2__lt:4 }, { feat_gt: 5 } ]

This should return all the object that have the prop1 = 3 AND prop2 = 4 OR other_prop is included in the defined array AND other_prop2 < 4 OR feat > 5