Added more tests for the current implementation of filterFilter, which prove that _deeply-nested_ predicate objects + _multiple conditions_ was not tested well enough, since some expected scenarios fail.

Problem: `filterFilter` is currently behaving like if it was using _OR_ operators (i.e. it doesn't matter if some conditions don't match as long as one does), and should be behaving like if it used _AND_ operators in order to be consistent with the original implementation for non-deeply-nested predicate objects.
`filterFilter` working with deeply-nested predicate objects was introduced in 1.2.13 as a result of angular#6215.

Author: albertboada

test/ng/filter/filterSpec.js

@@ -74,11 +74,17 @@ describe('Filter: filter', function() {
     var items = [{person: {name: 'John'}},
                  {person: {name: 'Rita'}},
                  {person: {name: 'Billy'}},
-                 {person: {name: 'Joan'}}];
+                 {person: {name: 'Joan'}},
+                 {person: {name: 'Albert', surname: 'Boada', contact: {country: 'Catalunya'}}}];
     expect(filter(items, {person: {name: 'Jo'}}).length).toBe(2);
     expect(filter(items, {person: {name: 'Jo'}})).toEqual([
       {person: {name: 'John'}}, {person: {name: 'Joan'}}
     ]);
+    expect(filter(items, {person: {name: 'Al',  surname: 'Bo'}})).toEqual([items[4]]);
+    expect(filter(items, {person: {name: 'foo', surname: 'Bo'}}).length).toBe(0);
+    expect(filter(items, {person: {name: 'Al',  surname: 'foo'}}).length).toBe(0);
+    expect(filter(items, {person: {name: 'Al',  contact: {country: 'cat'}}})).toEqual([items[4]]);
+    expect(filter(items, {person: {name: 'Al',  contact: {country: 'foo'}}}).length).toBe(0);
   });