Updated extraction rules to use gzip on compress'd data, removing the ncompress…

Updated extraction rules to use gzip on compress'd data, removing the ncompress extraction dependency

INSTALL.md

@@ -49,7 +49,7 @@ Binwalk relies on multiple external utilties in order to automatically extract/d
 
 ```bash
 # Install standard extraction utilities
-$ sudo apt-get install mtd-utils zlib1g-dev liblzma-dev ncompress gzip bzip2 tar arj lhasa p7zip p7zip-full cabextract openjdk-6-jdk cramfsprogs cramfsswap squashfs-tools
+$ sudo apt-get install mtd-utils zlib1g-dev liblzma-dev gzip bzip2 tar arj lhasa p7zip p7zip-full cabextract openjdk-6-jdk cramfsprogs cramfsswap squashfs-tools
 ```
 
 ```bash

src/binwalk/config/extract.conf

@@ -17,7 +17,7 @@
 ^lzma compressed data:7z:7z e -y '%e'
 ^xz compressed data:tar:tar xJf '%e'
 ^bzip2 compressed data:bz2:bzip2 -d -f '%e'
-^compress'd data:Z:compress -d '%e'
+^compress'd data:Z:gzip -d '%e'
 ^zip archive data:zip:jar xf '%e' # jar does a better job of unzipping than unzip does...
 ^posix tar archive:tar:tar xvf '%e'
 ^rar archive data:rar:unrar e '%e'