Merge pull request #6 from ikatson/feature-ttvplaylist-host-header

Change the way the URL is formed in ttvplaylist_plugin taking the "Host" header into account.
Host override removed
Raketa-tv.com plugin removed
Add support for HTTP HEAD requests.

May be needed by some clients, e.g. XBMC.
Merge branch 'feature-head-request-support'