Updates to blaze catalog design doc
Some catalog functionality, with ipython magics
Remove 'data' keyword from datashape
Create a sample catalog in the repo, and a short RST tutorial about it
Merge branch 'master' into catalog

Conflicts:
	docs/source/index.rst
Remove default catalog creation, add a function for it. Tweak docs.
Merge pull request #89 from mwiebe/catalog

a basic catalog