fixed GetTOTP, started rough QR code implementation

GetTOTP handles TOTP method retrieval for confirmation and deletion.

QR code implementation looks like it's gonna suck, so might end up
using a library for this later.

main.go

@@ -89,7 +89,6 @@ func main() {
             }
             username := os.Args[2]
             totpName := os.Args[3]
-            secret := controller.GenerateTOTPSecret(controller.TOTP_SECRET_LENGTH)
 
             account, err := controller.GetAccountByUsername(app.DB, username)
             if err != nil {
@@ -102,6 +101,7 @@ func main() {
                 os.Exit(1)
             }
 
+            secret := controller.GenerateTOTPSecret(controller.TOTP_SECRET_LENGTH)
             totp := model.TOTP {
                 AccountID: account.ID,
                 Name: totpName,