Add bintray deploy in travis build.

tools/travis_postbuild.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+DATEVAL=`date +%b-%d-%Y`
+VERSIONVAL=master
+
+# Use tag as version
+if [ $TRAVIS_TAG ]; then
+  VERSIONVAL=$TRAVIS_TAG
+fi
+
+sed -e s%@DATE@%${DATEVAL}% .bintray.in > .bintray.tmp
+sed -e s%@VERSION@%${VERSIONVAL}% .bintray.tmp > .bintray.json