Update Migration.php
Changed '_' to equal html code.
added codeception tests to frontend
Merge pull request #2452 from joni-jones/master

Changed '_' to equal html code.
modified buttons attributes to skip sf-crawler bug
added codeception to backend
added button attributes to skip sf-crawler bug
added codeception tests to common
added codeception main yaml
added codeception tests to console
added index tests files to application
added guide notes
newlines fixed, code-guy deleted
improved dependencies, guide
removed ordered list
formatting improved
correct lists fixed
Fixes #2453
Merge pull request #2451 from gonimar/patch-10

Consistent column naming
doc fix. [skip ci]