Update contao32 to 3.2.15.

Version 3.2.15 (2014-10-31)
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### Fixed
Always pass a DC object in the `toggleVisibility` callback (see #7314).

### Fixed
Correctly render the "read more" and article navigation links (see #7300).

### Fixed
Consider the `useSSL` flag of the root page when generating URLs (see #7390).

### Fixed
Fixed the FAQ sorting in the back end (see #7362).

### Fixed
Added the `Widget::__isset()` method (see #7290).

### Fixed
Correctly handle dynamic parent tables in the `DC_Table` driver (see #7335).

### Fixed
Correctly shortend HTML strings in `String::substrHtml()` (see #7311).

### Updated
Updated MooTools to version 1.5.1 (see #7267).

### Fixed
Updated swipe.js to version 2.0.1 (see #7307).

### Fixed
Use an `.invisible` class which plays nicely with screen readers (see #7372).

### Fixed
Handle disabled modules in the module loader (see #7380).

### Fixed
Fixed the "link_target" insert tag.

### Updated
Updated the ACE editor to version 1.1.6 (see #7278).

### Fixed
Fix the `Database::list_fields()` method (see #7277).

### Fixed
Correctly assign "col_first" and "col_last" in the image gallery (see #7250).

(taca)