Upgrade to coverage 3.7.1 and have it auto-build itself on first use.

third_party/coverage-3.7.1/coverage.egg-info/SOURCES.txt

Index: third_party/coverage-3.7.1/coverage.egg-info/SOURCES.txt
diff --git a/third_party/coverage-3.7.1/coverage.egg-info/SOURCES.txt b/third_party/coverage-3.7.1/coverage.egg-info/SOURCES.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6333630576675d8e50f940b4a6ec96ffdcb4025c
--- /dev/null
+++ b/third_party/coverage-3.7.1/coverage.egg-info/SOURCES.txt
@@ -0,0 +1,65 @@
+AUTHORS.txt
+CHANGES.txt
+MANIFEST.in
+README.txt
+__main__.py
+igor.py
+requirements.txt
+setup.cfg
+setup.py
+tox.ini
+coverage/__init__.py
+coverage/__main__.py
+coverage/annotate.py
+coverage/backward.py
+coverage/bytecode.py
+coverage/cmdline.py
+coverage/codeunit.py
+coverage/collector.py
+coverage/config.py
+coverage/control.py
+coverage/data.py
+coverage/debug.py
+coverage/execfile.py
+coverage/files.py
+coverage/html.py
+coverage/misc.py
+coverage/parser.py
+coverage/phystokens.py
+coverage/report.py
+coverage/results.py
+coverage/summary.py
+coverage/templite.py
+coverage/tracer.c
+coverage/version.py
+coverage/xmlreport.py
+coverage.egg-info/PKG-INFO
+coverage.egg-info/SOURCES.txt
+coverage.egg-info/dependency_links.txt
+coverage.egg-info/entry_points.txt
+coverage.egg-info/not-zip-safe
+coverage.egg-info/top_level.txt
+coverage/fullcoverage/encodings.py
+coverage/htmlfiles/coverage_html.js
+coverage/htmlfiles/index.html
+coverage/htmlfiles/jquery.hotkeys.js
+coverage/htmlfiles/jquery.isonscreen.js
+coverage/htmlfiles/jquery.min.js
+coverage/htmlfiles/jquery.tablesorter.min.js
+coverage/htmlfiles/keybd_closed.png
+coverage/htmlfiles/keybd_open.png
+coverage/htmlfiles/pyfile.html
+coverage/htmlfiles/style.css
+doc/api.rst
+doc/branch.rst
+doc/changes.rst
+doc/cmd.rst
+doc/config.rst
+doc/contributing.rst
+doc/excluding.rst
+doc/faq.rst
+doc/index.rst
+doc/install.rst
+doc/source.rst
+doc/subprocess.rst
+doc/trouble.rst