Added the ability to register menubar plugins

[astrofrog]

In some cases we might want to create plugins that are not tied to a specific GUI action. For instance, I am writing a small plugin that can be used to reorder components in a categorical component. Another example would be a plugin to edit data types of components. This sets up the framework to register plugins in a 'Tools' menu. We could also allow plugins to be added to any existing menu rather than defining a new one. @ChrisBeaumont - what do you think?

[astrofrog]

I think the failure in Travis is unrelated and due to a change in package versions available in conda

@ChrisBeaumont - any objections to merging this as is for now? I know that a few people at STScI are interested in making some plugins as part of a sprint, so would be nice to have that.

[ChrisBeaumont]

I'm on vacation / getting married this weekend, so I don't have time to
review this before next week. Feel free to merge in the meantime, else I'll
take a look Monday.

On Thursday, May 28, 2015, Thomas Robitaille notifications@github.com
wrote:

I think the failure in Travis is unrelated and due to a change in package
versions available in conda

@ChrisBeaumont https://github.com/ChrisBeaumont - any objections to
merging this as is for now? I know that a few people at STScI are
interested in making some plugins as part of a sprint, so would be nice to
have that.

—
Reply to this email directly or view it on GitHub
#644 (comment).

[astrofrog]

Oh of course please don't worry about it now!!

In the mean time, have a great weekend! 🎉 🎉 🎉

[astrofrog]

I'm going to go ahead and merge this and open an issue milestoned as 0.5 to remind us to re-examine this before releasing glue 0.5

[astrofrog]

The Travis failures are unrelated and due to something to do with the libpng version installed by conda