Drewtilities

Another forced update to get README fix through.

Forced update to get README fix through.

change download rate-limit, and some other cleanups
* FEATURE
* generate_downloader will now let you provide a max_per_hour for its internal rate-limit
default is 30
* provide a nice README that describes the various functions provided here
* DEV
* setup.py cleanups and new version pins
* make CHUNK_SIZE a variable

Test fix.
* DEV
* fix typo'd name in test

various fixes
* DEV
* fix travis.yml to fix install
* VERSION needed in package_data
* package needs to be drewtilities, not drewtils, to be on PyPI

no change, forced update for test purposes