Changes for issue #41

[dlnorgaard]

No description provided.

[coveralls]

Coverage remained the same at 0.0% when pulling ebe364e on dnorgaard-usgs:master into d5d5edb on usgs:master.

[tparker-usgs]

Combining the cleanup with your changes makes it difficult to see what changed. Can you separate those into two different commits?

[tparker-usgs]

I tested the refresh button with a WWS data source by doing the following and it behaved as expected.

1. Add channel to channel table. Click refresh and see new channel in list.
2. Add channel to grouplinks table. Click refresh and see channel in group list.
3. Delete channel from grouplinks table. Click refresh and see channel removed from group list, but still shown in All list.
4. Delete channel from channel table. Click refresh and see channel removed from All list.

[coveralls]

Coverage remained the same at 0.0% when pulling 9a48c80 on dnorgaard-usgs:master into d5d5edb on usgs:release-2.6.3.

[coveralls]

Coverage remained the same at 0.0% when pulling 05adc7c on dnorgaard-usgs:master into d5d5edb on usgs:release-2.6.3.

[coveralls]

Coverage remained the same at 0.0% when pulling d125602 on dnorgaard-usgs:master into d5d5edb on usgs:release-2.6.3.

[coveralls]

Coverage remained the same at 0.0% when pulling 2eb187f on dnorgaard-usgs:master into d5d5edb on usgs:release-2.6.3.