Log Message:
py-ephem: updated to 3.7.7.0

Version 3.7.7.0:
Upgraded libastro to 3.7.7.
The internal star catalog now includes all 57 navigational stars.
The rise, culminate, and set returned by next_pass() are now consecutive values \ 
for a single pass. Pass singlepass=False to return the original next_rise, \ 
next_culminate, next_set even if next_set < next_rise (the satellite is \ 
already up).
ephem.delta_t('0') now returns the correct value, instead of misbehaving for \ 
that particular input.