merge in upstream 0.21 release

Change-Id: I2803322a26044f194afe740635c051eeeb2bef2e
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0d20b64
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.pyc
diff --git a/README.chromium b/README.chromium
new file mode 100644
index 0000000..29489fa
--- /dev/null
+++ b/README.chromium
@@ -0,0 +1,11 @@
+Name: pyelftools
+Short Name: pyelftools
+URL: https://bitbucket.org/eliben/pyelftools
+Version: 0
+Revision: d23cf2f5bd2a3c3d6f516f0f2d01817ea83236fc
+License: Public Domain
+License File: LICENSE
+Security Critical: no
+
+Description:
+This contains Chromium OS's patched version of Eli Bendersky's pyelftools.