Fix high memory usage during archive unpack (#981)

Related to:
codeclysm/extract#10
codeclysm/extract@54043e8

Fix #975

Author: cmaglie

go.mod

@@ -11,7 +11,7 @@ require (
 	github.com/cmaglie/go.rice v1.0.3 // This one must be kept until https://github.com/GeertJohan/go.rice/pull/159 is merged
 	github.com/cmaglie/pb v1.0.27
 	github.com/codeclysm/cc v1.2.2 // indirect
-	github.com/codeclysm/extract/v3 v3.0.1
+	github.com/codeclysm/extract/v3 v3.0.2
 	github.com/fatih/color v1.7.0
 	github.com/fluxio/iohelpers v0.0.0-20160419043813-3a4dd67a94d2 // indirect
 	github.com/fluxio/multierror v0.0.0-20160419044231-9c68d39025e5 // indirect

go.sum

@@ -34,8 +34,8 @@ github.com/cmaglie/pb v1.0.27 h1:ynGj8vBXR+dtj4B7Q/W/qGt31771Ux5iFfRQBnwdQiA=
 github.com/cmaglie/pb v1.0.27/go.mod h1:GilkKZMXYjBA4NxItWFfO+lwkp59PLHQ+IOW/b/kmZI=
 github.com/codeclysm/cc v1.2.2 h1:1ChS4EvWTjw6bH2sd6QiMcmih0itVVrWdh9MmOliX/I=
 github.com/codeclysm/cc v1.2.2/go.mod h1:XtW4ArCNgQwFphcRGG9+sPX5WM1J6/u0gMy5ZdV3obA=
-github.com/codeclysm/extract/v3 v3.0.1 h1:uVutzakOCBzoguzMNs41FPLR7+x/2sIoiRA6hLbaLqA=
-github.com/codeclysm/extract/v3 v3.0.1/go.mod h1:NKsw+hqua9H+Rlwy/w/3Qgt9jDonYEgB6wJu+25eOKw=
+github.com/codeclysm/extract/v3 v3.0.2 h1:sB4LcE3Php7LkhZwN0n2p8GCwZe92PEQutdbGURf5xc=
+github.com/codeclysm/extract/v3 v3.0.2/go.mod h1:NKsw+hqua9H+Rlwy/w/3Qgt9jDonYEgB6wJu+25eOKw=
 github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
 github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
 github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=