Display skill caps in tooltip

[SpareSimian]

It would be handy when mousing over the stat frame if the caps for each skill for that class/spec were displayed. This would take into account talents, and might show the effect of raid buffs (ie. cap with and without expected buffs). Having this information at hand would make it easier to tweak gear to bleed off excessive stats to make room for inadequate ones.

[Milagros]

We will try to implement something like that for Cataclysm patch.