Merge pull request #31 from qudos-com/master

return traceback and error for failed tasks
Add setup classifiers
Add requirements for docs
Add doc templates
Document api
Don't show "Created by Sphinx"
Add doc link to readme
Enable custom sidebar templates
Remove Bitdeli badge
Bump up version to 0.3.3
Mark master as development version
Bump up development version to 0.4
Re-add pika, celery and tornado dependencies

These were correct in the 9d48b8a2cb012cb4f127a6918a2e251b4e497546
commit, but got dropped in the
ccfcb7f7cfa2f91d5cdfc1d3dfe0dd3931fb690c merge
Merge pull request #35 from rbu/readd-dependencies

Re-add pika, celery and tornado dependencies
Add Robert Buchholz to authors #35
Set release version to 0.3.4
Mark development version