Gemfile: upgrade mocha version (#16685)

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Crash in markdown formatter causes ruby process to end (#16781).

Patch by Jens Krämer.

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Use async email deliveries in rake tasks (#16784).

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Field set as read-only still available in the issues list context menu (#16755).

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Blank content type for attachments attached via Ajax file upload (Patch by Jens Krämer).

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Mailer.token_for generates invalid message_id when using from address with full name (#16619).

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Repository identifiers can be reserved words (#16564).

Patch by Felix Schäfer.

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fix typo of app/models/repository/cvs.rb

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fix typo of app/models/repository/mercurial.rb

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