Torrent scraping fixed + depds update + torrent from uri

[pisek]

Scraping of tracker did not work as expected. The String which was used as KEY to a map is infohash. This String was created with UTF-8 encoding which was wrong. Only actual text string should be encoded and decoded from and to UTF-8. Data should be encoded in some default encoding like ISO-8859-1. More about this here.

Version of selected libs was updated

Added test for BDecode, fixed FileCollectionStorageTest and added Util class with common static methods.