Instance Spec, v4

* http://www.curse.com/addons/wow/instance-spec

Does nothing in Legion for now. If spec switching returns, it will automatically resume previous functionality.

Before Legion this addon used to add a button below dungeon ready dialog that would allow you to quickly switch to your other spec if you need it to match your assigned role.

== Change log ==
2016-07-24 v4
* Disable itself if there's no spec group switching available (i.e. in Legion).

2016-04-07 v3
* Fix errors when player have no spec (e.g. no 2nd spec before level 30).

2015-11-03 v2
* Added "equipment manager" shortcut button to spec switch.

2015-05-19 v1
* Initial implementation.