switched to Pimple 2.0
feature #866 Switched Silex 2.0 to use Pimple 2.0 (fabpot)

This PR was merged into the 2.0-experimental branch.

Discussion
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Switched Silex 2.0 to use Pimple 2.0

... just about removing a bunch of characters...

Commits
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d50c749 switched to Pimple 2.0