Allow purchase of quest pet eggs in Market

Implements purchase in the Market of the two currently available pet quest eggs, after the user has completed the corresponding quest at least twice. This is a hard-code solution. @lefnire or others a little more adept in Angular might be able to make this generic and extensible with an ng-repeat. I couldn't get the expression quite right, and figured "soon" was better than "ideal" in this case.

CC: @lemoness