Merge branch 'develop' into 'master'

Implement "drop_sessions()" method

See merge request !2
7 jobs for master in 1 minute and 35 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Test
passed #4309
PHPCS

00:00:32

passed #4303
PHPunit:PHP5.3:MySQL

00:01:35

passed #4304
PHPunit:PHP5.6:MySQL

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passed #4305
PHPunit:PHP7.0:MySQL

00:01:27

passed #4306
PHPunit:PHP7.1:MySQL

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passed #4307
PHPunit:PHP7.2:MySQL

00:01:12

passed #4308
PHPunit:PHP7.3:MySQL

00:01:19