Merge branch 'develop' into 'master'

Implement "drop_sessions()" method

See merge request !2
7 jobs for master in 2 minutes and 41 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Test
passed #8501
PHPCS

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passed #8495
PHPunit:PHP5.3:MySQL

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passed #8496
PHPunit:PHP5.6:MySQL

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passed #8497
PHPunit:PHP7.0:MySQL

00:02:36

passed #8498
PHPunit:PHP7.1:MySQL

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passed #8499
PHPunit:PHP7.2:MySQL

00:02:37

passed #8500
PHPunit:PHP7.3:MySQL

00:02:28