Merge small prs

This fixes/merges the following issues/PRs:

- Add missing import https://github.com/dzone/osqa/issues/33
- Update readers.py https://github.com/dzone/osqa/issues/31
- Remove wrong import https://github.com/dzone/osqa/issues/34
- KeyError: 'content-type' in forum/views/meta.py https://github.com/dzone/osqa/issues/35