Adds some paths to gitignore.
Avoids crashing when ipsum.ini is not present.
Improves readme a bit.
Adds explicit license file.
Adds knowledge about image nodes for rst rendering.

This allows using `.. image:: something.png` in articles.
Merge pull request #1 from gradha/pr_docs_additions

Mostly doc additions
Merge pull request #13 from gradha/pr_render_images

Adds knowledge about image nodes for rst rendering.