Commit on behaf of Gervais

From Gervais:

I tried to ingest a wav file and it failed... ran the command on the command
line and did a quick Google search on the error. The suggestion was to add the
following flag to the lame call " --mp3input" I tried it and it worked...

I changed line 49 in derivatives.inc to read:
$command = "$lame_url -V5 --vbr-new --mp3input '${file}' '${outfile}'";

Did some testing and I successfully ingested my test mp3's and the wav file that
was not working and both worked fine....