Add PHP version checker task

[veewee]

Q	A
Branch	master
Bug?	no
New feature?	no
Question?	no
Documentation?	no
Related tickets

Since this tool is striving for good code quality, it is a logical step that the code cannot run on deprecated PHP versions.
A new task should be added that checks current PHP version against a configurable list of PHP versions and there End-Of-Life date.

A list of supported versions end their latest security update date can be found here:
http://php.net/supported-versions.php