Fix bug in release task and style fixes

tasks.py was building tarballs/sdists that didn't actually have vectors
in because of setup.pys reliance on the cwd.
diff --git a/vectors/setup.py b/vectors/setup.py
index 13b27c7..ce01e13 100644
--- a/vectors/setup.py
+++ b/vectors/setup.py
@@ -14,6 +14,7 @@
 from __future__ import absolute_import, division, print_function
 
 import os
+
 from setuptools import setup, find_packages