chunked file upload, take 2
retry
added round-trip test for chunked file upload
switch to using chunked upload
added STANDARD_RETRY_REQUEST and retryable_exceptions
clean up dead code and imports
fix print statements
updated readme for new command set
handle retry when platform gives HTML error messages
improved docstrings
read and close response stream in chunked upload; add timing to chunked upload
Merge pull request #50 from cbare/develop

added chunked uploads and RetryRequests decorator