doc+build: Prepare release 0.2.1

This commit also fixes build issue on Travis-CI

Change-Id: Ic48ec8ca5b196cd02215622284656aca78582aa0
diff --git a/.jenkins.d/10-get-sdk.sh b/.jenkins.d/10-get-sdk.sh
index 84d231d..d0810d9 100755
--- a/.jenkins.d/10-get-sdk.sh
+++ b/.jenkins.d/10-get-sdk.sh
@@ -3,8 +3,8 @@
 set -x
 
 SDK_VERSION=24.4.1
-BUILD_TOOLS_VERSION=21.1.2
-COMPILE_SDK_VERSION=21
+BUILD_TOOLS_VERSION=23.0.2
+COMPILE_SDK_VERSION=23
 
 SDK=android-sdk-linux