Merge branch 'release/0.8.2' into develop
Track: Fix find_alternative()

find_alternative() just returns False when no alternatives are available. If alternatives are available it returns True even if the alternatives are restricted.

This fixes it.
Merge pull request #2 from netrik/spotify.py
Return "None" to request callbacks if an error is encountered
Restructure the mercury/hermes request/response system (assume returned items match request)
Extra debug information added to mercury request/response
Fixed issue with request_wrapper() when used as a decorator
Added "container" parameter to MercuryRequest, fixes issue loading collection
Handle playlists() responses properly
Set "pyemitter" requirement to >=1.2.0
Bumped version to 0.8.3
Merge branch 'release/0.8.3'