Dottorrent

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* Implement filename pattern exclusion from PR 7 (--exclude, -x)

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* Add support for source strings (--source option)
* Exclude hidden dotfiles from being added
* Exclude hidden files on Windows (requires Python 3.5+)
* Refactor - CLI tool is now simply `dottorrent`

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* Use relative paths instead of absolute paths for directory mode path generation
* Add invalid input path check in get_info() and generate()

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* Use humanfriendly.format_size in binary mode
* Pin major versions of dependencies in requirements.txt and setup.py

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* Fix filename clobbering when filename contains parent path string (issue 2)

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* Allow both file and directory names to be specified for output_path (PR 1, mahkitah)