Add upload to bintray from travis.

Signed-off-by: Daniel Nephin <dnephin@docker.com>

script/travis/render-bintray-config.py

@@ -0,0 +1,9 @@
+#!/usr/bin/env python
+import datetime
+import os.path
+import sys
+
+os.environ['DATE'] = str(datetime.date.today())
+
+for line in sys.stdin:
+    print os.path.expandvars(line),