Deprecate weird module filenames

These are the only two module filenames that are not snake_case, so they should be renamed.

Note, these are not particularly popular modules, due to the targets being relatively rare, so I'm putting them on a 2 week deprecation clock, rather than the usual 60 days.

## Verification:

Running the deprecated versions of these modules should point you at the right module instead. See:

````
msf > use exploit/windows/fileformat/a-pdf_wav_to_mp3 
msf exploit(a-pdf_wav_to_mp3) > exploit

[!] ************************************************************************
[!] *                      This module is deprecated!                      *
[!] *              It will be removed on or about 2013-09-26               *
[!] *       Use exploit/windows/fileformat/a_pdf_wav_to_mp3 instead        *
[!] ************************************************************************
[*] Creating 'msf.wav' file ...
[+] msf.wav stored at /home/todb/.msf4/local/msf.wav
msf exploit(a-pdf_wav_to_mp3) > 
````