split up library and removed Stop() panic when called twice

blacklist.go

@@ -22,7 +22,7 @@ type MemBlacklist struct {
 	list BlacklistMap
 }
 
-// NewMemBlacklist
+// NewMemBlacklist implements the Blacklist interface using an in-memory map
 func NewMemBlacklist() *MemBlacklist {
 	return &MemBlacklist{list: make(BlacklistMap)}
 }