[testing] Reconsider used development packages [5.2.2-B1]

Some time ago, when decision was made to use Composer for dependency management following set of development packages was chosen:

• "aik099/phpunit-mink": "~2.0"
• "qa-tools/qa-tools": "~1.0"
• "aik099/coding-standard": "dev-in-portal"
• "mockery/mockery": "~0.9"
• "behat/mink": "~1.6"

Over time more on-topic packages were released and some pages no longer meet development requirements. 

Solution

1. replace "aik099/phpunit-mink" package with "qa-tools/phpunit-extension"
2. remove "mockery/mockery" package in favor of "phpspec/prophecy" package, that already comes bundled (means no need to include manually in "composer.json") with latest PHPUnit versions
3. change "~" in dependency versions into "^"

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