Add neq operator support for memory connector

See https://github.com/strongloop/loopback-datasource-juggler/issues/265

lib/connectors/memory.js

@@ -406,7 +406,7 @@ function applyFilter(filter) {
     if (typeof value === 'string' && (example instanceof RegExp)) {
       return value.match(example);
     }
-    if (example === undefined || value === undefined) {
+    if (example === undefined) {
       return undefined;
     }
     if (typeof example === 'object') {
@@ -425,6 +425,10 @@ function applyFilter(filter) {
         return false;
       }
 
+      if (example.neq) {
+        return compare(example.neq, value) !== 0;
+      }
+
       if (example.like || example.nlike) {
 
         var like = example.like || example.nlike;
@@ -445,7 +449,7 @@ function applyFilter(filter) {
       }
     }
     // not strict equality
-    return (example !== null ? example.toString() : example) == (value !== null ? value.toString() : value);
+    return (example !== null ? example.toString() : example) == (value != null ? value.toString() : value);
   }
 
   /**

test/memory.test.js

@@ -199,6 +199,30 @@ describe('Memory connector', function () {
       });
     });
 
+    it('should support neq operator for number', function (done) {
+      User.find({where: {order: {neq: 6}}}, function (err, users) {
+        should.not.exist(err);
+        users.length.should.be.equal(5);
+        for (var i = 0; i < users.length; i++) {
+          users[i].order.should.not.be.equal(6);
+        }
+        done();
+      });
+    });
+
+    it('should support neq operator for string', function (done) {
+      User.find({where: {role: {neq: 'lead'}}}, function (err, users) {
+        should.not.exist(err);
+        users.length.should.be.equal(4);
+        for (var i = 0; i < users.length; i++) {
+          if (users[i].role) {
+            users[i].role.not.be.equal('lead');
+          }
+        }
+        done();
+      });
+    });
+
     function seed(done) {
       var beatles = [
         {