Merge pull request #51 from fibn144/master

Add priority optional argument to modify_metadata method in Item class.
Moved `iacli` package into `internetarchive` package.
Moved `iacli` package into `internetarchive` package.
Added logging to upload_file() and get_metadata()
v0.5.2
Added auth module.
Added iarequest module.
Added session module.
Updated tests to reflect changes to `internetarchive.item`
Updated tests to reflect changes to `internetarchive.item`
Updated tests to reflect changes to `internetarchive.item`
1.0 refactor...
Removed s3 module
Added logging skeleton. Also, more 1.0 refactoring...
Test item has a new format. Fixed test.
Updated test to be compatible with 1.0 refactor.
Use "x-archive-auto-make-bucket" header by default for S3 requests."
Added default values for default attributes.
Merge branch 'master' of https://github.com/jjjake/ia-wrapper
The all-caps IMPORTANT FIX freakout in on of my previous commits was fixed in the merge.