minor #1549 Fix wrong namespace forward/backward slash (dol)
minor #1549 Fix wrong namespace forward/backward slash (dol)

This PR was squashed before being merged into the 2.2.x-dev branch (closes #1549).

Discussion
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Fix wrong namespace forward/backward slash

Commits
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e777147 Fix wrong namespace forward/backward slash

romainneutron/Silex,romainneutron/Silex,silexphp/Silex,romainneutron/Silex,gencer/Silex