Optional Mount Parameters (#123)

* adding optional parameters

* updating bodyText mount prop to default

* updating snapshot for new props

* adding parent element for mounting

* adding null default for parentElement

* adding dist to gitignore

* adding test case for mounting to element

* adding div to document in test

* unmount after test

* updating test to pass

* updating eslint to handle certain rules as warning and fix others

jest/cssTransform.js

@@ -1,8 +1,8 @@
 module.exports = {
   process() {
-    return 'module.exports = {};'
+    return 'module.exports = {};';
   },
   getCacheKey() {
-    return 'cssTransform'
+    return 'cssTransform';
   },
-}
+};

jest/fileTransform.js

@@ -1,7 +1,7 @@
-const path = require('path')
+const path = require('path');
 
 module.exports = {
   process(src, filename) {
-    return `module.exports = ${JSON.stringify(path.basename(filename))};`
+    return `module.exports = ${JSON.stringify(path.basename(filename))};`;
   },
-}
+};