pelican.conf.py: Enable DELETE_OUTPUT_DIRECTORY

We had some issues with output/ being unclean on some devs' copies
and it caused confusion when trying to reproduce bugs some devs
were experiencing.

This ensures output/ is always cleaned before building.
Add new post about playing with hardware-accelerated AES
Merge pull request #40 from alanorth/aesni

Add new post about playing with hardware-accelerated AES
Merge pull request #38 from alanorth/clean-output

pelican.conf.py: Enable DELETE_OUTPUT_DIRECTORY
Show article author on posts #39
Merge pull request #41 from raymondwanyoike/feature/show-article-author

Show article author on posts (Issue #39).
Update crowsfoot submodule
Merge pull request #42 from raymondwanyoike/feature/update-crowsfoot-submodule

Lazzzzzzzzzzzzima.
Merge branch 'master' of git://github.com/nairobilug/nairobilug.or.ke

* 'master' of git://github.com/nairobilug/nairobilug.or.ke:
  Update crowsfoot submodule
  Show article author on posts #39
  Add new post about playing with hardware-accelerated AES
  pelican.conf.py: Enable DELETE_OUTPUT_DIRECTORY

Conflicts:
	crowsfoot