Add X-Count header when slicing collection

src/routes.js

@@ -36,6 +36,9 @@ routes.list = function(req, res, next) {
   }
 
   if (_start) {
+	res.setHeader('X-Count', resource.length)
+	res.setHeader('Access-Control-Expose-Headers', 'X-Count')
+
     resource = resource.slice(_start, _end)
   }
 

test/server.js

@@ -61,7 +61,11 @@ describe('Server', function() {
         .get('/comments?_start=1&_end=2')
         .expect('Content-Type', /json/)
         .expect(low.db.comments.slice(1, 2))
-        .expect(200, done)
+        .expect(200)
+        .end(function(err, res){
+          assert.equal(res.headers['x-count'], 5)
+          done()
+        })
     })
   })