added vidx.to resolver

Vidx.to (a copy of the streamcloud resolver with slight adaptions)
resolver returns unresolvable() instead of False

resolver returns self.unresolvable() instead of False
fixed self.unresolvable() call
180upload - fix download link capture
fix vidbull
vidbull - support embedded links
Merge pull request #127 from worstperson/patch-1

fix 180upload and vidbull
Merge pull request #126 from KayK/master

added vidx.to resolver