Let's add -Xlint:unchecked to build.gradle

You can see that -Xlint:deprecated is also there, but commented out.
Mostly because I'm not prepared to fix them all just now.  :)

build.gradle

@@ -43,6 +43,11 @@ dependencies {
     testCompile "junit:junit:$junitVersion"
 }
 
+compileJava {
+    options.encoding = 'UTF-8'
+    options.compilerArgs << "-Xlint:unchecked" // << "-Xlint:deprecation"
+}
+
 task acJar(type: Jar) {
 	dependencies {
 		// Just to pass the compile step; these classes are stripped out below.