Added KiDS support:
- Added --survey argument to LensTractor.py
- Created kids.py with the following functions:
  - KIDSWCS, KIDS_IQ, KIDS_photocal, KIDS_epoch
- Added kids.py to __init__.py
- Added survey support for photcal and epoch in dm.py
- Added KiDS support to dm.py
Added example lens from KiDS.
Merge branch 'develop'
+ Added support to specify plot settings per survey.
+ The sace of the KiDS residual 'chi' images is not in units of sigma.
  It should be checked whether this causes problems with the modeling.
Merge branch 'develop'
Better variance files for KiDS example.
LT now properly open source
Note on citation
Merge remote-tracking branch 'upstream/master'
LT now properly open source.