added tool to get a specific catalog
Vizier has multiple URLs queryable
added find_catalogs utility
bug fixes: need decorators, decorators break __doc__ appending
__init__ uses explicit import instead of wildcard
updated docs for vizier, and get_catalog -> get_catalogs
fixed the find_catalogs tool such that you get Resources back and can
therefore see the author list
added docstring to find_catalogs
fixed docstrings: most queries return TableLists, not Tables
refactored all of the configurable items: I think they had no effect
since they were called at import rather than any time after.  I'm still
not sure this approach works.  Added docs for changing row limits
allow return type to be change in Vizier.  This should probably never be
used, but it can be useful for debugging (e.g., for bad votables)
Merge pull request #140 from keflavich/vizier-catalog

Vizier find_catalogs and get_catalogs