Added QueryResult and patched bugs

QueryResult now stores result items and position data, which aligns more
strongly with the rest of the library features than a plain
[]interface[}.  The design of the parser_test unittest was revised to
use array/map/scalar serialization (like match_test), since Go 1.3
redesigned maps to randomly order their keys. Since naive comparisons of
map data is now no longer possible, the unittest now sorts map
keys:value combinations.

* Patched a bug where getPosition("") was returning an invalid Position
* Revised parser_test to use serialization for comparisons for Go 1.3

toml.go

@@ -28,7 +28,7 @@ type TomlTree struct {
 func newTomlTree() *TomlTree {
 	return &TomlTree{
 		values:   make(map[string]interface{}),
-		position: Position{0, 0},
+		position: Position{},
 	}
 }
 
@@ -103,7 +103,7 @@ func (t *TomlTree) GetPath(keys []string) interface{} {
 // GetPosition returns the position of the given key.
 func (t *TomlTree) GetPosition(key string) Position {
 	if key == "" {
-		return Position{0, 0}
+		return t.position
 	}
 	return t.GetPositionPath(strings.Split(key, "."))
 }