Python is dropping support for PY3.4 on  2019-03-16. Therefore we are dropping support as well. See #760.

Closes #786.

Recursively run substitution to handle overlapping matches.
Fixes #458.

All whitespace characters should be treated the same by inline patterns.
Previoulsy, emphasis patterns were only accounting for spaces, but not
other whitepsace characters such as newlines. Fixes #783.

Adjust pattern to allow for escaped hashes, but take care to not treat
escaped escapes before hashes as escaped hashes. Close #762.

Previously only newlines preceded by whitespace were collapsed. Fixes #742.

This essentially implements the closest we can get to PEP 562 which allows for modules to control `__dir__` and `__getattr__` in order to deprecate attributes. Here we provide a wrapper class for the module in `util`. If a module has attributes that need to deprecated, we derive from the wrapper class and define the attributes as functions with the `property` decorator and the provided `deprecated` decorator. The class is instantiated with the module's `__name__` attribute and the class will properly replace the module with the wrapped module.  When accessing the depracted attributes, a warning is raised. Closes #739.