Django-staticimport

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* fixing 'FileNotFoundError: [Errno 2] No such file or directory' when downloading.
* adding MANIFEST.in
* update setup.cfg file
* update AUTHORS to AUTHORS.md
* update LICENSE to LICENSE.md
* update CHANGELOG to CHANGELOG.md
* deleting __init__.py file

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* adding django command download_static_file
* update static libraries
* update README.md file

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* update static libraries

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* Added proper documentation.
* Added validation to script, style, img tags.
* Fixed error when user add a local static file to HOSTED_LIBS and try to import it to a template.

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* Adding support for remote javascript libraries as (angularjs, jquery, react, etc).
* Adding is_remote and is_local variables to import.html file, to support remote libraries.
* Adding settings.py files.
* Updating README.md file.
* Adding documentation.
* Adding requirements folder.

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* updating setup.py file, error when reading long description.
* Updating .travis.yml file.