admin: Improvements to micropub endpoint's photo handling. - Add `.jpg` extension to photos that don't have any extension. - Add photos in the config section instead of the body, so that the layout can put them in separate `u-photo` tags.

sudo: false
language: python
python:
  - "3.4"
  - "3.5"
  - "3.6"
install:
  - "python setup.py version -f 2.0"
  - "python setup.py sdist --formats=zip"
  - "pip install dist/PieCrust-2.0.zip"
script:
  - "py.test"