[PATCH] Fix find()'s docs on nested subconditions

The documentation says that you need to write (P & Q) | R
like this:

{
    'conditions': [
        {
            'query': {
                'conditions': [P, Q],
                'operator': '&'
            }
        },
        R
    ],
    'operator': '|'
}

but actually you need to omit the { 'query': ... } wrapping the
subclause. Including it crashes parseCondition() at:

    v = condition['value']

for the obvious reason.

pandora/item/views.py

@@ -112,10 +112,8 @@ def find(request, data):
                 operator: string, // comparison operator, see below
                 value: string // value
             }, { // ... and/or query objects (nested subconditions)
-                query: {
                 conditions: [object, ...], // list of condition objects
                 operator: string // logical operator, '&' or '|'
-                }
             }],
             operator: string // logical operator, '&' or '|'
         },