Add init docstring for simulations package
Improve API, created a superclass

New API superclass for Station and Network
Contains main support functions and url formats
Skip tests when no internet is available,
e.g. the api 'urls json' can not be retrieved.
Fix find trigger offset for event with bad trace

If a baseline can not be determined for a trace.
The baseline/pulseheight/integral/.. are set to -999.
The trace may still have participated in the trigger,
just ignore trace from not-present detectors (-1).
Add new trigger time column for ESD downloading

Note; This is incompatible with the previous ESD version
Update esd test

Add new column
Weird, I thought that was fixed..
Bump version to 0.9.11

Fixes a bug in CoincidencesESD.
Improved API code.
Prepare ESD module for new ESD column (incompatible with old ESD).
Improved trigger timing, no longer ignores traces with a bad baseline.
Merge branch 'master' into refactor_reconstructions