changed debug to have a sensible default in all providers
changed charset to have a sensible default in all providers
feature #852 Provider default values (fabpot)

This PR was merged into the 2.0-experimental branch.

Discussion
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Provider default values

When using the service providers outside of a Silex context, the `debug` and `charset` might not be defined. This PR gives them sensible defaults.

Commits
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c9cd665 changed charset to have a sensible default in all providers
0dbc3ed changed debug to have a sensible default in all providers