Refactored NotFoundHttpException, closes #1521.
Merge pull request #1576 from zikula/api-refactor

This PR was merged into zikula:1.3 branch.

Discussion
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Refactored NotFoundHttpException, closes #1521.

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | ---
| Fixed tickets | #1521
| Refs tickets  | ---
| License       | MIT
| Doc PR        | ---

Commits
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550d7d8b411f6e42b885f272a33cf7d940128f35 Refactored NotFoundHttpException, closes #1521. cmfcmf