Use Python 2 /3 compatible source (no 2to3)
Remove bundled astroquery/extern/six.py
Use astropy.extern.six instead of Astroquery bundled version
Fix monkey patching of urllib in test_utils.py
Fix ImportError on Python 3
Python 3 fixes (so that it works without 2to3)
Minor Python 3 fix in splatalogue pointed out by @keflavich
Merge pull request #320 from cdeil/no_2to3

Use Python 2 /3 compatible source
Fixed handling of duplicated form inputs
Do not add forms inputs without name to payload
Updated documentation for Eso package.
Minor sphinx improvement.
Added help option to Eso.instrument_query()
Improved Eso.query_instrument() interface.

Using `columns` and `column_filters` keywords instead of the generic
`**kwargs`.
Improved help for query_instrument()

A checkbox looking like `[ ]` now shows which columns can be
controlled. The default columns in the output are ticked like `[x]`.
Added beautifulsoup4 dependency.
Added beautifulsoup4 to .travis.yml