Code cleanup; added some extraction API methods.
Code cleanup; added some extraction API methods.

ddcc/binwalk,chubbymaggie/binwalk,pombredanne/binwalk,devttys0/binwalk,ddcc/binwalk,itsens/binwalk,itsens/binwalk,cappiewu/binwalk,sundhaug92/binwalk,sundhaug92/binwalk,cappiewu/binwalk,chubbymaggie/binwalk,devttys0/binwalk,pombredanne/binwalk