* Added For and Item tags
* Removed Sequence node support from ForItem tag
* Added ForItemIndex tag
* Added support for iterating over mappings
* Added support for mapping output body
* Renamed tags: For to Enumerate, ForItem to Value, ForItemIndex to Index
* Refactored tests
* Formatting
* Improved exception info
* Improved error handing
* Added docs
* lint
* Small doc improvements
* Replaced deepcopy() call with call to copy()
* Fix mistake in docs example
* Fix missed "!" in example