Fixes to the `cache` Jinja tag. * Thread safety, since it stores common data potentially coming from pages baked at the same time. * Correctly capture and restore modifications made to the execution context (e.g. sources used in the captured section).

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title: You're Missing A Few Things
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It looks like you're not meeting some of the requirements for running **PieCrust**:

* PHP 5.3+

For more information, be sure to check out the [documentation](http://bolt80.com/piecrust/doc).