Fix extract-all for flat input zip (#14)

* Added /build/ directory to .gitignore

* Fixed bug initialising aff4.LogicalImage instances

* fixed bugs in extract()

* fixed aff4.extractAll() NameError exeption

* Fix call to extractAll function

This patch is partially necessary to correct the `--extract-all` flag.
With this correction, `--extract-all` will work if there were no
directories ingested from an input zip.

Issue 15 reports on the problem with directories from an ingested zip.
#15

This patch builds on Pull Request 13, as I'd also found the binary-
output mode was necessary, though in a different spot.
#13

Signed-off-by: Alex Nelson <[email protected]>

aff4.py

@@ -309,7 +309,7 @@ def extractAll(container_name, destFolder):
                         except OSError as exc:  # Guard against race condition
                             if exc.errno != errno.EEXIST:
                                 raise
-                    with open(destFile, "w") as destStream:
+                    with open(destFile, "wb") as destStream:
                         shutil.copyfileobj(srcStream, destStream)
                         print ("\tExtracted %s to %s" % (pathName, destFile))