Rewrite .gitignore file a bit and add some rules
Create buildout config

On Windows using virtualenv/buildout combo is easier than using raw virtualenv/pip, commit
files used by buildout to configure environment.
Use a relative path for the test image

It's part of the issue #20 (weird path on Windows). Django File class used
a full file path which resulted in path like C:\Example\pinry\static\C:\... which
is obviously invalid.