Add some tests, .gitignore, and move some stuff around

.gitignore

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+node_modules
+.DS_Store

index.js

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+module.exports = process.env.XML_COV ? require('./lib-cov/stablexml') : require('./lib/stablexml');

test/index.js

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+var assert = require("assert");
+suite('StableXML', function() {
+
+	var XMLParser = require("../index");
+	var parser;
+
+	setup(function() {
+		parser = new XMLParser();
+	});
+
+	suite("#parseXML()", function() {
+		test("should produce <test />", function() {
+			parser.parseXML("<test />", function(err, results) {
+				assert.deepEqual(results, [{ test:{} }]);
+			});
+		});
+		test('should produce <test foo="bar" />', function() {
+			parser.parseXML('<test foo="bar" />', function(err, results) {
+				assert.deepEqual(results, [
+					{
+						test: {
+							$: {
+								foo: "bar"
+							}
+						}
+					}
+				]);
+			});
+		});
+		test('should produce <test><foo /></test>', function() {
+			parser.parseXML('<test><foo /></test>', function(err, results) {
+				assert.deepEqual(results, [
+					{
+						test: {
+							_: [
+								{
+									foo: {}
+								}
+							]
+						}
+					}
+				]);
+
+			});
+		});
+	});
+
+});