Move tool versions into config

Change-Id: Ia75eb20a50571aa6f8ebb80596962694d2d535fa
diff --git a/propLoader.gradle b/propLoader.gradle
index a370204..4b2dfe9 100644
--- a/propLoader.gradle
+++ b/propLoader.gradle
@@ -8,6 +8,7 @@
 if (forceReleaseVersion) {
     databindingProperties.version = databindingProperties.releaseVersion
 }
+databindingProperties.compileSdkVersion = Integer.parseInt(databindingProperties.compileSdkVersionStr)
 def repoBase = databindingProperties.mavenRepoAbsolutePath == "." ? root : databindingProperties.mavenRepoAbsolutePath
 databindingProperties.mavenRepoDir = "${repoBase}/${databindingProperties.mavenRepoName}"
 databindingProperties.extraPluginsRepoDir = "${root}/${databindingProperties.extraPluginsRepoName}"