Update attendees_and_learners.rst

I added my name
Update attendees_and_learners.rst

Add Craig Barnes
Update attendees_and_learners.rst

Added name to UK PyCon 2014 list.
Update attendees_and_learners.rst

Fix missing whitespace
Add Davide Ceretti to attendees and learners
Merge pull request #265 from cjbarnes18/craig

Update attendees_and_learners.rst
add attendees (merge)
merged
merged
Update attendees_and_learners.rst