Add retrieving active group from session.

[msporny]

Please check to make sure I implemented get/setActiveGroup correctly.

[dlongley]

This seems like it's application specific -- not a general feature. Is that true? Is there another way we can get some support code in here for what you're trying to do in a more generic way?

Also, the information isn't going into the session on the server at all -- it's just a client-side thing. I would expect that if we did anything client-side, it would be done perhaps as a cache? I'm a little confused about this PR in general, I suppose.

[msporny]

@dlongley said:

This seems like it's application specific -- not a general feature. Is that true? Is there another way we can get some support code in here for what you're trying to do in a more generic way?

Setting and getting the active group is now a general feature... Bedrock supports it. Using the feature is application specific and is usually performed on login/logout. For applications that need groups, they will add the group and set the default group on login if it's not already set. For applications that don't need groups, they won't call these APIs.

@dlongley said:

Also, the information isn't going into the session on the server at all -- it's just a client-side thing. I would expect that if we did anything client-side, it would be done perhaps as a cache? I'm a little confused about this PR in general, I suppose.

Session information available via AngularJS is a combination of information on the back-end and information that is cached on the front-end. If we don't use this approach, the developer has to juggle a new concept, which is "client-side session information" and "server-side session information", which seems like unnecessary complexity.

[mattcollier]

@dlongley @msporny It would be good to get this PR handled as we look towards our ES6 release cycle.