Have a progress bar for S3 upload

[moulip]

When issuing awless create storageobject, it would be nice to have a progress bar.
Thanks dev-team ;-)

[simcap]

Done. This is showing progress dynamically using correct bytes unit (Mega, Giga, ...):

awless create storageobject bucket=wallix-simon-test file=./awless

Confirm? (y/n): y
[info]    uploading './awless'

21.3 MB/36.8 MB

(Note this it not an actual progress bar as per say yet for implementation reasons. See commit if interested)

[simcap]

Available in master or in upcoming 0.0.21