* FIX: use mix from the project root directory
* Move find root project function to autoloaded handlers
* add tests for #ale#handlers#elixr#FindMixProjectRoot
* Look for ini file to spot project root
When looking for the project root folder it would be better
to check for some well-known init file instead of __init__.py.
Indeed, with python3 it is now possible to have namespace modules
where intermediate dirs are not required to include the __init__.py file.
* Break if statement conditions over several lines
* Add blank lines for the if block
* Add test for FindProjectRoot
* Typo: missing / for MANIFEST.in
* Fix test for non-namespace package
* Add more test cases
