Fixes #354 - Reverting Redirect changes

[Navilois]

Fixes #354

Revert "All Controllers: changed every occurrence of Response.Redirect to Redirect"

This reverts commit 5fa3a90.

[erw13n]

Don't revert the change that been made.
Response.Redirect is causing a lot of error on event logs as reported in #112 and hotcakes forum

The implementation of Redirect was wrong, it should be "return Redirect" instead of "Redirect"

Related to #368

[WillStrohl]

This PR cannot be accepted as-is. It breaks numerous checkout workflows.