Cleanup
Deal with new astropy IO identifier
Fix README link
Fix travis build trigger test
Merge pull request #203 from glue-viz/staging

Cleanup
Merge pull request #204 from glue-viz/plotly_legend

Plotly legend
Merge pull request #207 from glue-viz/staging

Cleanup
Support for ND images
CASA Image loader
Reposition ND slider
Merge pull request #206 from glue-viz/nd_image

ND Image Support
Fix #208. Prevent error message if histogramming NaNs