do not clobber prexisting size hints
Merge pull request #12 from rajbot/master

Use `pip install .` instead of requirements.txt for travis-ci.
Added download subcommand.
Added optional feature to download files from items concurrently using the gevent networking library. If the option is selected, but gevent is not installed an, ImportError exception will be raised with a message detailing how to install gevent with a single pip command.
Added --formats option to the metadata subcommand. This makes it easy to retrieve a list of file formats contained within an item, which can be used for selectively download files with the download subcommand.
Removed duplicate accidental line.
Forgot to convert line from argparse to docopt...
Upped version.
Cleaned up docs. Use **kwargs when calling upload_file() from upload().
Merge remote-tracking branch 'samuel-archive/master'
Merge branch 'master' of github.com:jjjake/ia-wrapper
Merge branch 'master' of github.com:jjjake/ia-wrapper into fast
define header_names on separate line for easier reading.
Upped version.
Revert "define header_names on separate line for easier reading."

This reverts commit 47e4b652ae12cf124615e68694b31a330ac4c8a7.
Mergeing docopt and concurrent download branches...
Minor doc fix.
Updated requirements -- removed argparse / added docopt.
Updated docs to reflect minor changes in `ia` script, and changed style of example to correspond to the docstrings in `ia`.
Fixed misspelling in gevent import