Get proper filename from decoded URL

Uses unescape to convert URL encoded characters to proper ASCII.

Examples
Before Fix: Sonic_the_Hedgehog_Childhood_%28Act_2%29_OC_ReMix.mp3
After Fix: Sonic_the_Hedgehog_Childhood_(Act_2)_OC_ReMix
Merge pull request #2 from johnjbroderick3/master

Get proper filename from decoded URL