Upload files using a glob pattern

[danielc2013]

Background:
There is another ticket which is supposed to allow for multiple file uploads. It would also be beneficial to allow for regex/wildcards and the ability to preserve a directory structure in S3.

Depends On: #7

ToDo:
Extend the existing upload functionality to also accept glob-type patterns (*,?,[a-Z], etc) and upload all the files matching that pattern. Multiple patterns should also be supported, and if duplicates are found, only upload once
Example:
crossing-go put -k alias/crossing-go-key -b s3://my-big-bucket ./*.go ./*.py