Don't use "store:application" for backwards compat.

"store:main" as the name for the store in the resolver is deprecated as of
ember-data 1.0-beta19 and replaced with "store:application". That's an issue
to address later. For now, we want these tests to run with older ember-datas.

tests/integration/adapters/pouch-test.js

@@ -39,7 +39,7 @@ function adapter() {
 }
 
 function store() {
-  return App.__container__.lookup('store:application');
+  return App.__container__.lookup('store:main');
 }
 
 test('can find all', function (assert) {