fetching list of documents


Interface similar to mongolab - http://docs.mongolab.com/restapi/#list-documents
- ```q=<query>``` - restrict results by the specified JSON query
- ```c=true``` - return the result count for this query
- ```s=<sort order>``` - specify the order in which to sort each specified field (1- ascending; -1 - descending)
- ```sk=<num results to skip>``` - specify the number of results to skip in the result set; useful for paging
- ```l=<limit>``` - specify the limit for the number of results

#### Examples
```
// find all active items
GET /doc/item/?q={"active":true}

// get the number of inactive items
GET /doc/tour/?q={"active":false}&c=true

// find the 10 most expensive items
GET /doc/tour/?l=10&s={"price": -1}

// find items from 10 to 20 sorted by title
GET /doc/tour/?l=10&sk=10&s={"name": 1}
```

#### Response example
```
{ 
  objects:  [ { 
       data: [Object],
       type: 'http://sharejs.org/types/simple',
       v: 1,
       docName: 'iphone5s',
       m: null 
  }, { 
       data: [Object],
       type: 'http://sharejs.org/types/simple',
       v: 1,
       docName: 'iphone6',
       m: null 
  }, { 
       data: [Object],
       type: 'http://sharejs.org/types/simple',
       v: 1,
       docName: 'iphone6plus',
       m: null 
  } ] ,
  meta: { 
       limit: 3, 
       offset: 1, 
       total_count: 4 
  },
}
```