Search custom criteria

Some times we need to do custom queries to mongo collections. 
Now We can send request.data.criteria with values that matchs config search for that collection.

Takes config:
```
Scheds: {
fulltxt: [ 'title' ],
101             facets: [],
102             criteria: { between: '{ "start": { "$gte": %value% }, "end": { "$lt" : %value% } }' },
103             max_facets: 100
104         }
```