Easier reporting for users

[steven-murray]

Currently, there is a reasonably nice system in place that catches full errors and reports them to be fixed. However, if the user sees a problem in a certain plot (with certain parameters) that doesn't cause an error but just looks wrong in some way, it would be great if there was an easy way to report it.

This could be a button at the top of the image page that automatically captures all the models/parameters, makes a pdf of the plot, and then sends either an email or creates a github issue (probably email in case the user doesn't have github). It could also be a little button next to each model, so a specific model can be reported.

[steven-murray]

This is mostly done. The buttons have been added, and all models/parameters are reported to sentry. However, it does not send a plot, and that might be useful, if possible.