Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  3d58bd74a5cb3dc33423b40013e45c276b0b8991
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(testing) method to exclude certain browsers in selenium tests

- this adds the possibility to exclude tests from beeing
executed in specific browsers
- e.g. a test can be marked as "exclude_firefox" if it should
not be run under firefox

Change-Id: Ie6f892d82358252a7118563027706789cf18f088