Filter exams courses by id

Signed-off-by: Frca <killerfrca@gmail.com>
Logging registering info into file on sdcard

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Remove unused versioned style resources

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Fix exam_detail button bar

Signed-off-by: Frca <killerfrca@gmail.com>
Put HttpResponse headers into app Response object

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Disable redirecting

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Create new Exam object though static method, which returns existing Exam object if found in file

Signed-off-by: Frca <killerfrca@gmail.com>
Fix exam after registration

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Limit RegisteringService registering loop duration

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Send only 3 requests per second instead of 10

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Many fixes, entities handling rewritten

Signed-off-by: Frca <killerfrca@gmail.com>