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

third_party/coverage-3.6/coverage/version.py

Index: third_party/coverage-3.6/coverage/version.py
diff --git a/third_party/coverage-3.6/coverage/version.py b/third_party/coverage-3.6/coverage/version.py
deleted file mode 100644
index 181ba847647795579b1e1974d4d291e0524c3805..0000000000000000000000000000000000000000
--- a/third_party/coverage-3.6/coverage/version.py
+++ /dev/null
@@ -1,9 +0,0 @@
-"""The version and URL for coverage.py"""
-# This file is exec'ed in setup.py, don't import anything!
-
-__version__ = "3.6"         # see detailed history in CHANGES.txt
-
-__url__ = "http://nedbatchelder.com/code/coverage"
-if max(__version__).isalpha():
-    # For pre-releases, use a version-specific URL.
-    __url__ += "/" + __version__