Log Message:
Update contao35 to 3.5.25.

Version 3.5.25 (2017-03-20)
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### Fixed
Only show error messages to authenticated users in the install tool (see #8666).

### Fixed
Always show the modal windows in full height (see #8631).

### Fixed
Support cross domain requests when rebuilding the search index (see #8597).

### Fixed
Correctly store numbers with leading zero in the Config class (see #4035).

### Fixed
Delete an old search entry if the new URL is more canonical (see #8647).

### Fixed
Also make Folder::$dirname an absolute path again (see #8325).

### Fixed
Support using namespaces and use statements in DCA/config files (see #8635).