Merge pull request #428 from opdemand/419-git-push-master-doc

Note that deis only supports `git push` to master, refs #419.

Author: mboersma

docs/components/build.rst

@@ -6,7 +6,10 @@
 
 Build
 =====
-Deis builds are created automatically on the controller when a 
+Deis builds are created automatically on the controller when a
 developer uses ``git push deis master``.
 
 When a new build is created, a new :ref:`release` is created automatically.
+
+.. note::
+	Deis only supports ``git push`` to the **master** branch.