playlist.py: adding .copy() to locals() preventing kwargs to be sent …

[myselfhimself]

…over HTTP

Both static() and basic() functions use kwargs = locals() in order to retrieve the long list of keyword arguments as a dictionary. This is practical, however in python 2.7.6, the actual "kwargs" variable does get scanned by locals() and added as a reference to that dictionary. This ends in kwargs == {...variables key-value pairs..., "kwargs": {the same key-value pairs as before}} and that ugly variable is then sent online to the Echo Nest API.. Using kwargs = locals().copy() removes that kwargs=>kwargs embedded key-value pair.

This also occurs in song.py... Let us check that later.

[myselfhimself]

This seems to happen maybe only during a debugging session... Or actually does not happen on my production server. I am not sure whether this pull request is really relevant...