Added tests differentiating between lexical and mathematical integers.

Integer literals should be considered integers, while mathematical integers can
be specified with divisibleBy.

See: json-schema/json-schema#27

Closes #2

Author: Julian

tests/draft3/type.json

@@ -13,6 +13,11 @@
                 "data": 1.1,
                 "valid": false
             },
+            {
+                "description": "a float is not an integer even without fractional part",
+                "data": 1.0,
+                "valid": false
+            },
             {
                 "description": "a string is not an integer",
                 "data": "foo",

tests/draft3/uniqueItems.json

@@ -13,6 +13,11 @@
                 "data": [1, 1],
                 "valid": false
             },
+            {
+                "description": "numbers are unique if mathematically unequal",
+                "data": [1.0, 1.00, 1],
+                "valid": false
+            },
             {
                 "description": "unique array of objects is valid",
                 "data": [{"foo": "bar"}, {"foo": "baz"}],