CS fixes
minor #436 CS fixes (keradus)

This PR was squashed before being merged into the 0.5.x-dev branch (closes #436).

Discussion
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CS fixes

Commits
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b01fb18 CS fixes
Psr0FixerTest - Fixer do not print anything, so there is no need to catch and check output buffer
minor #441 Remove risky test: Psr0FixerTest - Fixer do not print anything. (keradus)

This PR was merged into the 0.5.x-dev branch.

Discussion
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Remove risky test: Psr0FixerTest - Fixer do not print anything.

Psr0FixerTest - Fixer do not print anything so there is no need to catch and check output buffer.
This allow us to remove risky test reported by PHPUnit

Commits
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9de4de1 Psr0FixerTest - Fixer do not print anything, so there is no need to catch and check output buffer
Fixed the access to private static properties and methods
Changed the error message about the PHP requirement to go to STDERR
Merge pull request #445 from stof/patch-3

minor #445 Changed the error message about the PHP requirement to go to STDERR (stof)
Merge pull request #444 from stof/patch-2

minor #444 Fixed the access to private static properties and methods (stof)
Fixer::fix - no need to manually sort fixers, they are sorted inside prepareFixers method
Fixer::sortFixers - sort by priority, level and name
FixCommand::getFixersHelp - append priority at end of fixer descr
FixerTest::testThatFixersAreSorted - fix test case
regenerate README.rst
Fixer::sortFixers - downgrade PHP