Minor bug fix.
Previous will give 'Invalid action' message if user doesn't provide the --action option
Fixed #141
The error was cased by the 'None' value of the 'template_path' from

template_dir = os.path.dirname(template_path)
The previous changes are incorrect. The previous code log all the resources in the limit_to as not found and generate attribution on all the resources that are not in the limit_to.
Minor code changes and comments
Added a test case for generate attribution with default template
Fixed #137 - remove the 'about_resource_path' in the generated ABOUT file and keep it in the generated CSV file.
Removing mistaken csv commit
Renaming top level Python package to ease merging later.
Merge branch 'develop' of
https://github.com/dejacode/about-code-tool.git into simplification
Fixing failing tests across OS.

os.walk order is not the same on windows and linux.
Therefore the order of file loading is not deterministic. 
This order dicted the order or custom fields and standard fields in some
corner cases.
Fixing our own ABOUT files
Completing manual merge of latest develop in simplification