Merge tag '0.13.2' into develop

Version 0.13.2
Add console color parser to beautify the composer output.
Add test case for console color parser and activate travis builds.
Implement backspace and carriage return parsing in color converter.
Utilize new parser also in DetachedController.
Drop now obsolete class Utils.
Set minimum-stability to dev and prefer-stable to true.

This is needed as Contao 3.3.* has dependency on contao/idna
which has never been tagged and is now obsoleted already.
Small fix in color parser - generated CSS was invalid.

The correct notation for color is rgba(r,g,b,a) and not rgb(r,g,b,a).
Add branch alias check to build chain.
Merge branch 'master' into develop
Reformat code according to PSR-1/PSR-2
Introduce phpmd.
Switch to PSR-4 style directory structure.

The custom class loader already supporting this kind of loading, because
it just refer the __DIR__ path to include other classes in the same
namespace.
Now the directory structure is changed to match the PSR-4 style.
Do not add composer.lock and composer.phar to repository.
Remove Dominik Zogg as maintainer.

Dominik is no longer an active maintainer of the project. We thank
Dominik for his efforts and wish him every success.
Rename project to contao-community-alliance/composer-client.
Add composer validate CI test.
Ignore some files from code style check.
Fix languages files to pass code style checks.
Add badges to readme.