Adding Mediatek Firmware formats

Update deps.sh to support CentOS

I hope this signature does not cause too many false positives.

The rm option no longer deletes 0-size files; it also verifies that the file being deleted was not modified by the extractor

Fixed bug which caused multiple file data to be extracted to the same directory; added binwalk.modules.extractor.output dictionary to provide paths to the base output directory for each file.

add signature for encrypted qnap firmware

fix minor spelling errors

fix previous commit that modified sasquatch arguments (ab2ace76)

arguments to sasquatch were being passed in wrong order, breaking extraction

explicitly attempt both byte-orderings with sasquatch

modify vxworks signature to avoid false positives

add vxworks version signatures

fix more signedness issues