Merge pull request #72 from quantopian/update-jupyter-versions

MAINT: Update supported IPython/Notebook versions.

REL: Release 0.5.3.

Apparently 0.5.2 already happened.

REL: Release 0.5.2.

Fixes a bug in the `generate_files` utility where a non-notebook file in
the database would cause an exception.

REL: Release 0.5.1.

- Adds a new `fetch` command to the `pgcontents` CLI for fetching a
  single notebook.
- Adds utilities for offline processing of notebooks from the pgcontents
  database.
- Adds utilities for encrypting and decrypting notebooks for many users.
- Pegs `notebook` dependency to < 5.0.

Merge pull request #27 from quantopian/release-0.5

REL: Release 0.5.0.

REL: Bump to 0.4

BLD: Remove Jupyter trove classifier.

No such classifier exists.

Merge pull request #10 from quantopian/release-0.2

MAINT: Release 0.2

DOC: Add missing colon to README.