Update contao41 to 4.1.2, a leaf package.

### 4.1.2 (2016-03-22)

* Handle derived classes in the exception converter (see #462).
* Prevent the autofocus attribute from being added multiple times (see contao/core#8281).
* Respect the SSL settings of the root page when generating sitemaps (see contao/core#8270).
* Read from the temporary file if it has not been closed yet (see contao/core#8269).
* Always use HTTPS if the target server supports SSL connections (see contao/core#8183).
* Adjust the meta wizard field length to the column length (see contao/core#8277).
* Correctly handle custom mime icon paths (see contao/core#8275).
* Show the 404 error page if an unpublished article is requested (see contao/core#8264).
* Correctly count the URLs when rebuilding the search index (see contao/core#8262).
* Ensure that every image has a width and height attribute (see contao/core#8162).
* Set the correct mime type when embedding SVG images (see contao/core#8245).
* Handle the "float_left" and "float_right" classes in the back end (see contao/core#8239).
* Consider the fallback language if a page alias is ambiguous (see contao/core#8142).
* Fix the error 403/404 redirect (see contao/website#74).

(taca)