Merge branch 'fix-filters' into develop

Closes #75.

* fix-filters:
  Fix filter projection parsing

Author: jamesls

jmespath/parser.py

@@ -57,9 +57,9 @@ class Parser(object):
         'or': 5,
         'flatten': 6,
         'star': 20,
+        'filter': 20,
         'dot': 40,
         'lbrace': 50,
-        'filter': 50,
         'lbracket': 55,
         'lparen': 60,
     }

tests/compliance/filters.json

@@ -294,5 +294,22 @@
         "result": []
       }
     ]
+  },
+  {
+    "given": {
+      "foo": [
+        {"a": 1, "b": {"c": "x"}},
+	{"a": 1, "b": {"c": "y"}},
+	{"a": 1, "b": {"c": "z"}},
+	{"a": 2, "b": {"c": "z"}},
+	{"a": 1, "baz": 2}
+      ]
+    },
+    "cases": [
+      {
+        "expression": "foo[?a==`1`].b.c",
+        "result": ["x", "y", "z"]
+      }
+    ]
   }
 ]