Issue#87 settings online offline

[coveralls]

Pull Request Test Coverage Report for Build 421

• 216 of 249 (86.75%) changed or added relevant lines in 15 files are covered.
• 5 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+2.09%) to 84.934%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
contour/compute_interface.py	1	2	50.0%
contour/models.py	28	31	90.32%
virocon/s3utils.py	0	3	0.0%
contour/views.py	30	34	88.24%
contour/signals.py	27	32	84.38%
virocon/settings.py	20	25	80.0%
contour/plot.py	72	84	85.71%
<!--	Total:	216	249	86.75%	-->

Files with Coverage Reduction	New Missed Lines	%
contour/plot.py	1	83.17%
contour/models.py	2	87.83%
contour/views.py	2	76.47%
<!--	Total:	5		-->

Totals
Change from base Build 394:	2.09%
Covered Lines:	1353
Relevant Lines:	1593

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💛 - Coveralls

[ahaselsteiner]

For some reason travis build #420 failed for the first time. However, after restarting it, it succeeded.