DEV: Provides an example pre-commit hook.

This pre-commit hook can be activated by copying or symlinking to
the .git/hooks directory

This particular commit hook is best suited for git versions < 1.8.2
The running of nosetests would be better suited for a push hook,
but those are not added until 1.8.2.

etc/git-hooks/pre-commit

@@ -0,0 +1,19 @@
+#!/bin/sh
+#
+# An hook script to verify linting and passing unit tests.
+#
+# Called by "git commit" with no arguments.  The hook should
+# exit with non-zero status after issuing an appropriate message if
+# it wants to stop the commit.
+#
+# To enable this hook, copy or symlink to your repo's
+# ".git/hooks/pre-commit".
+#
+# Please read the following as it will execute on your machine on each commit.
+
+set -e
+
+# Run flake8 linting
+flake8 zipline tests
+# Run unit tests
+nosetests -x