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

.eslintrc

@@ -7,7 +7,10 @@
   "extends": "airbnb",
   "rules": {
     "no-underscore-dangle": 0,
-    "react/jsx-filename-extension": [1, { "extensions": [".js", ".jsx"] }]
+    "react/jsx-filename-extension": [1, { "extensions": [".js", ".jsx"] }],
+    "import/prefer-default-export": 1,
+    "import/no-extraneous-dependencies": 1,
+    "no-await-in-loop": 1
   },
   "plugins": ["react"],
   "settings": {