Actually fix bug in visit-level chip and sky fixes (#39)

Conflicts:
	stile/hsc/base_tasks.py
Try a thing for fixing visit-level sky and chip coords (#39)
Actually fix bug in visit-level chip and sky fixes (#39)
Fixed a bug which might be caused by merge (#39)
Merge branch 'master' of https://github.com/msimet/Stile into #39