Using foreign IDs with pyechonest Song instantiations due to their issue with Song.id and Song.track_id.

demo.py

from pyechonest import config
from pyechonest.song import Song
	
# Loading Bangarang by Skrillex...
song = Song('id:rdio-US:track:t14313937')
song = Song('id:spotify-WW:track:6VRhkROS2SZHGlp0pxndbJ')
song = Song('TRVOJIZ13A9CFBB670')

proxies.py

class SongProxy(GenericProxy):
    
    #...

    # found at line 157
    def get_attribute(self, *args, **kwargs):
    	## ADDED CODE ##
    	if self.id.startswith('id:'):
        	kwargs['track_id'] = self.id
        else:
        	kwargs['id'] = self.id
        ## ADDED CODE ##
        
        return super(SongProxy, self).get_attribute(*args, **kwargs)