AU: Delta Diff Generator

Adds a class that can take two root filesystem image and generate a
delta between them. Currently it's not very well tested, but this will
improve once the diff applicator is written.

Also, an executable to run the generator.

Other changes:
- Stop leaking loop devices in unittests
- extent mapper: support sparse files, ability to get FS block size
- AppendBlockToExtents support sparse files
- subprocess more verbose on errors
- add WriteAll to utils (WriteAll avoids short-write() returns)
- mkstemp wrapper for ease of use
- VectorIndexOf, finds index of an element in a vector

Review URL: http://codereview.chromium.org/891002
diff --git a/bzip.cc b/bzip.cc
index 4a41980..3ac15d8 100644
--- a/bzip.cc
+++ b/bzip.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "update_engine/gzip.h"
+#include "update_engine/bzip.h"
 #include <stdlib.h>
 #include <algorithm>
 #include <bzlib.h>