Add helper to make releases

Author: saghul

tasks.py

@@ -0,0 +1,14 @@
+
+import invoke
+
+# Based on https://github.com/pyca/cryptography/blob/master/tasks.py
+
+
+@invoke.task
+def release(version):
+    invoke.run("git tag -a fibers-{0} -m \"fibers {0} release\"".format(version))
+    invoke.run("git push --tags")
+
+    invoke.run("python setup.py sdist")
+    invoke.run("twine upload -r pypi dist/fibers-{0}*".format(version))
+