trailing & is not allowed in script queries
Vizier: must pass multiple option selections separately; comma-separated
is invalid
fix tests
Add another remote test
vizier: mask instead of raising exceptions for bad VOtables (they're
unpredictable - we don't want to raise exceptions if some of the data is
invalid... though we do want to at least warn folks... hmm)
safer version: WARN keyword added for invalid votables
regression test for invalid tables
Merge pull request #352 from keflavich/simbad_minor

Trailing & not allowed in script queries
Merge pull request #353 from keflavich/vizier_keyword_fix

Some fixes to Vizier
.travis: sphinx upgrade
use wheels for sphinx 1.2.1
Vizier: refactor to use the generic AstroResponse/AstroRequest and
related caching tools.  Local tests pass now.  Remote tests will be run
when internets r availablz
add a verification step in the data retrieval process to avoid spamming
the ESO servers with invalid queries
eso: simpler return statement as per Derdon's suggestion
eso: fix function name
eso: change 'data_retrieval' to 'retrieve_data'
eso: docs data_retrieval -> retrieve datasets
eso: deprecation warning for data_retrieval
fix retrieve_data namet
docs: cleanup coordinates import (from astropy import coordinates) and
use 0.4-style coordinate declaration.
Also, added a new index of services by type