История коммитов

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Added getter to simplify resource usage
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Added the AbstractResource class and did some refactoring
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#196 Added saving of the current page on which the user is located
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Bugfix in the debugbar
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Updated packages. Fixed tests
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#196 Added setting the date of the user's last visit.
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Some optimization
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Some design fixes
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Fixed showing the user role in the guestbook
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Fixed saving a username in the guestbook