Add support for naming a group

[jvincilione]

I have issued a pull request for adding a button for collapsing a group (#534) Along with that feature, I think it would be good to add a feature where a user could add a "group name" for each group if they so desired. That way they could have a point of reference for each collapsed group as to what is in it.

I'm open to do the work if it's something that may be desired by others as opposed to just my implementation needs.

Regarding how to go about exporting/importing the group name for SQL: I would think we could use inline comments before each set of parens. I'm open to discuss the best implementation for exporting/importing the sql.

When saving/loading as json/mongo, I assume we could add a groupName attribute to the export results and if it's present, import it into the group title in import cases.

[mistic100]

The current implementation of SQL Parser does not support comments. And I don't think it's a good idea to alter the MongoDB output with metadata. I think this is something that has it's place only in the JSON representation.

[mistic100]

Forget about the "data" (I edited my message), this can be a new property of the Group object, like "not-group" plugin adds a "not" property.

[jvincilione]

Ok, is it something you're interested in having built out? My specific implementation needs it for SQL, but I'd be more than happy to work on it for JSON

[jvincilione]

I have finished the work for naming groups. I tied it to the plugin for collapsing as I think they should be tied together. Since the other pull request was not merged, I'm going to add it to that pull request unless you would prefer me not to.