Add test for integer hash key lookup

Float will still not work :/

Author: sshaw

spec/property_string_spec.rb

@@ -4,7 +4,7 @@
 
 module Collections
   def a_hash
-    {:a => 123}
+    {:a => 123, 1 => "you got an int"}
   end
 
   def an_array
@@ -159,6 +159,11 @@ def baz
       expect(ps["foo.bar.baz"]).to eq 123
     end
 
+    it "returns the object's value for an integer key" do
+      ps = PropertyString.new(Obj.new)
+      expect(ps["foo.a_hash.1"]).to eq "you got an int"
+    end
+
     it "returns the object's value for an array index" do
       ps = PropertyString.new(Obj.new)