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Merge remote-tracking branch 'origin/master'
Update BrowserStack automate key

Signed-off-by: Michal Čihař <michal@cihar.com>
Fix return type

Signed-off-by: Michal Čihař <michal@cihar.com>
Fix return type

Signed-off-by: Michal Čihař <michal@cihar.com>
Remove plugin manager and observer classes

We don't really need the observer pattern, so let's simplify the code.

Signed-off-by: Michal Čihař <michal@cihar.com>