can-ajax compatibility and StacheDefineElement teardown

Bug fixes

can-ajax

• can-ajax v2.4.4 - Replace const with var
  Replaced single const declaration with var to match the rest of the code and fix a stealjs strict error in iOS

can-define-mixin

• can-define-mixin v0.3.2 - fixes case with Proxy use as a super in Safari

can-stache-define-element

• can-stache-define-element v0.6.2 - Properly teardown when removed inside of a stache template