added a cookbook about managing assets
minor #833 added a cookbook about managing assets (fabpot)

This PR was merged into the master branch.

Discussion
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added a cookbook about managing assets

This was not documented before and as we get many PRs on adding more abstraction in Silex about assets (see #697 or #733), I wanted to demonstrate that everything is as easy as it can get without any further helper functions in Silex itself.

Commits
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b045442 added a cookbook about managing assets