test fix
More contracts
Add size, position kwargs to GlueApplication.start

Closes #469
Update window titles when layers are removed

Closes #517
test fix
typo. Closes #523
Power through WCS nonconformity

Closes #527
Fix ndim bug
Updated WCSAxes to 0.3
Add dialog box for setting vmin/vmax

Closes #521
Recover from invalid wcs
Custom subset layer actions