Remove special treatment of the range "0-"
Accept range end position which exceededs the resource size

RFC 2616 14.35.1 Byte Ranges

   If the last-byte-pos value is absent, or if the value is greater than
   or equal to the current length of the entity-body, last-byte-pos is
   taken to be equal to one less than the current length of the entity-
   body in bytes.
Merge pull request #7 from basho/ss-range-fix

Range header fix