…e [gh-48]

* **Added** init config `extensions` for 3rd party extension access in custom tags [gh-44]
* **Added** Whitespace Control [gh-46]
* **Changed** The `empty` tag in `for` loops is now `else` [gh-49]
* **Changed** `forloop` vars to `loop` closes [gh-47]
* **Fixed** `include` tag's `with` and `only` args documentation [gh-50]

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