composers autoload order for compatibility with TYPO3 Flow framework

This small change allow using the cboden/Ratchet out of the box with TYPO3 Flow.

Unfortunately TYPO3 Flow can not load second entry given in the manifest for autoloading (Source: http://docs.typo3.org/flow/TYPO3FlowDocumentation/stable/TheDefinitiveGuide/PartIII/PackageManagement.html#using-3rd-party-packages )

Only one of both tricks is needed in Flow's Settings.yaml:

:1. excluding annotations
<pre>
TYPO3:
  Flow:
    reflection:
      ignoredTags: ['event', 'temporary', 'type', 'note']
</pre>
:2. excluding this package from Object Framework (Note: this makes AOP for Ratchet off)
<pre>
TYPO3:
  Flow:
    object:
      excludeClasses:
        'cboden.Ratchet': ['Ratchet\\.*']
</pre>
).