Placeholder for further improvements and ideas

[sgeb]

• List of files sortable by size
• Display date of last modification
• Cache metadata locally, update periodically using eTag
• Extract logTransport into separate library
• Display periodic updates on download/upload progress, speed and ETA
• Support CLI options to switch between 1000 and 1024 size units (i.e. MB vs MiB). I prefer the former, Amazon Cloud Drive displays the latter. Currently uses the latter to not confuse users where acdcli would display different sizes from amazon on the web.
• ls accepts multiple parameters on the commandline
• create intermediate directories for the target of a download
• Commands share and unshare
• Make sure paths work on windows (see os.IsPathSeparator)
• Command sync