Update contao35 to 3.5.9, a leaf package.

Version 3.5.9 (2016-03-21)
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### Fixed
Prevent the autofocus attribute from being added multiple times (see #8281).

### Fixed
Respect the SSL settings of the root page when generating sitemaps (see #8270).

### Fixed
Read from the temporary file if it has not been closed yet (see #8269).

### Fixed
Always use HTTPS if the target server supports SSL connections (see #8183).

### Fixed
Adjust the meta wizard field length to the column length (see #8277).

### Fixed
Correctly handle custom mime icon paths (see #8275).

### Fixed
Only log errors that have been configured to get logged (see #8267).

### Fixed
Show the 404 error page if an unpublished article is requested (see #8264).

### Fixed
Correctly count the URLs when rebuilding the search index (see #8262).

### Fixed
Ensure that every image has a width and height attribute (see #8162).

### Fixed
Set the correct mime type when embedding SVG images (see #8245).

### Fixed
Handle the "float_left" and "float_right" classes in the back end (see #8239).

### Fixed
Consider the fallback language if a page alias is ambiguous (see #8142).

### Fixed
Fix the error 403/404 redirect (see contao/website#74).

(taca)