Change definition of summary/description break

In this commit I have made the following documentation changes:

- Changed short description to summary
- Changed long description to description
- Changed example mail address
- Changed definition when a summary breaks and becomes a description
  to match PSR-5 and actual usage.
Integrated code review feedback
Determine custom vendor dir if vendor-dir is added/changed
Update Bootstrap.php
Update Application.php
Update JmsSerializerServiceProvider.php
Update phpdoc
Update phpunit.xml.dist
Update FeatureContext.php
Fix feedback on PR
Merge pull request #1353 from mvriel/feature/RD-34

Change definition of summary/description break
4 unit tests and added setters in class 'Parameter'

Unit tests for all classes in Transformer\Event that have methods.
Two setters added in Transformer\Template\Parameter
Unit test for Transformer\Template\Parameter
changed the way it goes
forgot vendor dir
misused operation
fixed test
removed some excluded dirs and add ansible instead
new unit test

Unit test for phpDocumentor\Transformer\Writer\Collection
Add inherited_from element on inherited methods
corrections in Parameter and in two unit tests

In Parameter: changed @return Parameter into @return $this
In PreXslWriterEventTest: changed DOMDocument into DOMElement
In CollectionTest added:
- testOffsetSetWriterReceivesRouterQueue()
- testOffsetGetWithExistingIndex()
and changed testOffsetSetAndCheckRequirements() into
testCheckRequirements()