Add some verbosity when reporting finished downloads

For example:

    [download] Resuming download at byte 1868140
    [download] Destination: Entry #1-Bn59FJ4HrmU.flv
    [download] 100% of 3.27MiB in 4s

This format is meant to somewhat mirror the behavior of wget(1) when reporting finished downloads:

    100%[==================>] 54,836,682   788KB/s   in 74s

    2013-08-04 12:32:05 (728 KB/s) - 'google-chrome-stable_current_x86_64.rpm' saved [54836682/54836682]
Merge pull request #1181 from h3xx/master

Add some verbosity when reporting finished downloads

Remove the mixed use of tabs and spaces for indentation.
Show the time taken to download in the same format as the ETA