Add *.swp to .gitignore
Fix test/good.simple.obj faces

They no longer reference normals and text_coords (the OBJ does not
contain any of them)
Implement basic parsing of actual OBJ data

- Before, the vertices, normals, and faces arrays contained dummy data
  (although its sizes were correct)

- Now they contain (correct?) data (tests pending)
Add tests for Mesh data parsing
Bump version minor