Merge branch 'add/gitlab-ci' into 'master'

Add GitLab CI

Closes #2

See merge request !1
6 jobs for master in 11 minutes and 34 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
failed #231
allowed to fail
PHPunit:PHP5.3:MySQL

00:03:26

passed #232
PHPunit:PHP5.6:MySQL

00:04:54

passed #233
PHPunit:PHP7.0:MySQL

00:05:32

passed #236
PHPunit:PHP7.1:MySQL

00:06:01

passed #235
PHPunit:PHP7.2:MySQL

00:05:19

failed #234
PHPunit:PHP7.1:MySQL

00:18:04

 
Name Stage Failure
failed
PHPunit:PHP5.3:MySQL Test
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