Merge pull request #201 from keflavich/ogle-to-local-tests

OGLE partial refactor
add a "testing tool" to disable/enable internet completely in a given
python session in order to test whether non-remote tests are trying to
access the internet
import & use turn_internet_off throughout
turn internet back on at the end of scripts
minor change to Exception raised by off-internet guard
*removed* local turn on/off of tests, since they're run at import time,
which is wrong
*added* global turn off in conftest.py
use patching in test_splatalogue
added splatalogue setup_package
test_utils has a string-based parsing moved to remote_data