Update SDK and build tools version

New SDK: 19
New Build Tools: 18.1

Change-Id: Ie0048a0346bf633f3acfda9bd0a463811abb0bc1
diff --git a/templates/include/common.ftl b/templates/include/common.ftl
index 15ce49d..59f6410 100644
--- a/templates/include/common.ftl
+++ b/templates/include/common.ftl
@@ -39,9 +39,9 @@
 <#elseif (sample.compileSdkVersion)?has_content>
     <#assign compile_sdk = sample.compileSdkVersion/>
 <#else>
-    <#assign compile_sdk = 18/>
+    <#assign compile_sdk = 19/>
 </#if>
 
 
 <#-- Set the global build tools version -->
-<#assign build_tools_version='"18.0.1"'/>
+<#assign build_tools_version='"18.1"'/>