Add $this->db class check in RestyApi::_dbAction()
- $this->db must be an instance of mysqli
Add mysqli class check to RestyApi::response()
- Before closing the database connection check if $this->db is an
  instance of mysqli
Add improvements to the demo app
- (DemoApi.php) Save and update requests will now return the saved/updated
  todo
- (todosApp.html) Add save buttons to the app (better touchscreen support)
Update updateTodoCompletedStatus() in todosApp.html (demo file)
- Forgot to update the updateTodoCompletedStatus() method in the previous
  commit. The method now receives the updated todo from the PUT request.
Update title of todosApp.html and add a reference to RestyApi.
Update todosApp.html
- Checking a todo will now remove the input tag
Add _buildDb() method to DemoApi.php
- Eliminates the need to have a separate .sql file
Update README.md
- Add licensing information
- Remove protocol from all links (i.e. 'http/https')
Add reference to the TodoMVC project (todosApp.html)