Return to the old return value of parseUncompressed

This reverts two changes: first, returning the size from
 `parseUncompressed` together with the data, rather than just the data;
second, returning both the name and the value of the root node as values
(`{root: <name>, value: <value>}`) rather than a key/value pair
(`{<name>: <value>}` or just `<value>` if no name).

Concerning the read offset as a return value, that definitely doesn't
belong there. If that value is required it should be exposed elsewhere
on the object rather than being tacked onto the value.

nbt.js

@@ -258,8 +258,15 @@
 		var name = reader.string();
 		var value = reader.compound();
 
-		var result = { size: reader.offset, value: { root: name, value: value } };
-		return result;
+		// The root is a key/value pair. If the key is empty,
+		// just return the value.
+		if (name === '') {
+			return value;
+		} else {
+			var result = {};
+			result[name] = value;
+			return result;
+		}
 	};
 
 	this.parse = function(data, callback) {

test/nbt-spec.js

@@ -13,10 +13,9 @@ describe('nbt.parse', function() {
 			nbt.parse(data, function(err, data) {
 				if (err)
 					throw error;
-				expect(data.value.root).to.equal('Level');
-				expect(data.value.value.stringTest.value).to.equal(
-				'HELLO WORLD THIS IS A TEST STRING ÅÄÖ!');
-				expect(data.value.value['nested compound test'].value).to.deep.equal({
+				expect(data.Level.stringTest.value).to.equal(
+					'HELLO WORLD THIS IS A TEST STRING ÅÄÖ!');
+				expect(data.Level['nested compound test'].value).to.deep.equal({
 					ham: {
 						type: "compound",
 						value: {