allow usage of limit parameter in pouchdb adapter queries

README.md

@@ -289,6 +289,28 @@ export default Ember.Route.extend({
 });
 ```
 
+Limit to 5 documents.
+
+```javascript
+// app/routes/smasher/index.js
+import Ember from 'ember';
+
+export default Ember.Route.extend({
+  model() {
+    return this.store.query('smasher',  {
+      filter: {
+        name: 'Mario',
+        debut: { '$gte': null }
+      },
+      sort: [
+        { debut: 'desc' }
+      ],
+      limit: 5
+    })
+  }
+});
+```
+
 Note that this query would require a custom index including both fields `data.name` and `data.debut`.  Any field in `sort` must also be included in `filter`.  Only `$eq`, `$gt`, `$gte`, `$lt`, and `$lte` can be used when matching a custom index.
 
 ### store.queryRecord(model, options)

addon/adapters/pouch.js

@@ -351,6 +351,10 @@ export default DS.RESTAdapter.extend({
       queryParams.sort = this._buildSort(query.sort);
     }
 
+    if (!Ember.isEmpty(query.limit)) {
+      queryParams.limit = query.limit;
+    }
+
     return db.find(queryParams).then(pouchRes => db.rel.parseRelDocs(recordTypeName, pouchRes.docs));
   },