More helpful message about bsdtar missing
Handle GitHub 302 redirects (fixes #102)

 - http://bourbon.io/docset/bourbon.tgz was redirecting to /docset/bourbon.tgz
Show tooltip for external URLs (#82)
Merge pull request #108 from MichaelBeeu/linktooltips

Show tooltip for external URLs (#82)
Wait for docset unpacking in DownloadCompleteCb

Branch at DownloadCompleteCb now waits for docset unpacking and only
after sends completion signal to docset progress bar and total progress
bar.

This fix will probably close #50.
Docset progress bar now waits for docset unpacking and only after shows