fix tests and revert the removal of kwargs in eso.query_instrument
use RA/Dec instead of source name in a test.  Add a check for network
errors
whoops, left a debug statement in
some generalization of response checking and test fixes
last sesame workaround
Merge pull request #329 from keflavich/eso_fixes_may11_2014

Some more bugs uncovered in the ESO API and remote tests