restructuring of simbad docs and addition of edit on github extension
Add class_or_instance class to astroquery/utils
Added a brief class description
Added query.py for BaseQuery class
Add astroquery.exceptions
Merge pull request #114 from jdnc/add-exceptions-module

Add astroquery.exceptions
Added functools.update_wrapper approach to preserve function metadata.
Renamed file to class_or_instance.py
Added test for class_or_instance
Changed import in init file as per rename
made minor fix regarding whitespace in docstring assert
Merge pull request #111 from jdnc/class-or-instance

Add class_or_instance class to astroquery/utils
Added new QueryWithLogin class and removed unnecessary methods
Merge pull request #113 from jdnc/add-query-class

Added query.py for BaseQuery class
Merge pull request #96 from keflavich/simbad_example

restructuring of simbad docs and addition of "edit on github" extension