remove a TODO and cleanup DI configuration


| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | yes (imagine_filter to imagine_filters)
| Deprecations? | no
| Tests pass?   | see travis
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

as imagine_filter has several children, i added the s but with a fixXmlConfig at least.