Added a test for rendering the same template more than once. Currently fails
Fixed a bug where calling `render` on a Pea object with a template that has been read wouldn't change after the 1st time
Made the `pre_rendered_content` variable make more sense
Incremented the gem version to `1.3.1`
Merge pull request #2 from andyhmltn/fix-second-render-bug

Fix second render bug