This test currently fails, fix in the following commit.
The test loads an svg with a group with a transform with "scale(1,-1)".
This situation can mess up arc sweeps, resulting in corrupted paths.
* Fixed document.flatten_group(~) for nested groups and added a test
* Add space for PEP8 conformance
* Add documentation for document.get_group()
* Use group_search_xpath to be consistent and customizable
* Fix lexical mistake in comments
* Fix grammar mistake in comments
* Some progress (and added CONTRIBUTING.md)
* fixed documentation line-width to be PEP 8 compliant
* fixed documentation line-width to be PEP 8 compliant
* style changes
* made some design changes
* Make the Document class available when importing the library
* Add a method to parse transform strings
* Iterate on the implementation of the Document class
* Tweaks to transform parsing implementation
* Implementing a depth-first flattening of groups
* Finish implementation of flatten_paths
* Beginning to write tests for groups
* Refactoring flatten_paths() into flatten_all_paths()
* Clean up implementation of document classes
* Debugging xml namespace behavior -- needs improvement
* Improve the way the svg namespace is handled
* Print out some paths to see that they're sane
* Fix multiplication of numpy matrices -- need to use .dot() instead of operator*
* Create a unit test for parsing SVG groups
* Return a reference to an element instead of a copied dictionary of attributes
* Add a test for <path> elements that contain a 'transform' attribute
* minor docstring improvements
* got rid of svg2path changes (reverted to master)
* updated to match master
* Remove accidental paranthesis
* Remove unnecessary import
* Use a default width and height of 0, as dictated by SVG specs, in case width or height is missing
* Expose the CONVERSIONS and CONVERT_ONLY_PATHS constants
* Fix the use of some numpy operations
* Remove untested functions
* Fix add_group() and write tests for adding groups and paths
* Update documentation of document module
* Add tests for parsing transforms
* Update the module name for svg_to_paths
* Improve Python3 compatibility
* Try to improve compatibility
* More tweaks for compatibility