Merge pull request #7 from ikatson/feature-head-request-support

Add support for HTTP HEAD requests.
Move PluginInterface to 'modules' folder and fix stat and helloworld plugins
Remove old torrent-tv.ru plugin (ttvplaylist)
New module: PlaylistGenerator. Right now it can only generate .m3u's
New torrent-tv.ru plugin (torrenttv)
Use PluginInterface from modules folder in acehttp
New plugin: ytv.su