Removing wpilib stuff from coverage. (#16)

photon-server/build.gradle

@@ -133,4 +133,12 @@ jacocoTestReport {
     reports {
         xml.enabled true
     }
+
+    afterEvaluate {
+        classDirectories.setFrom(files(classDirectories.files.collect {
+            fileTree(dir: it,
+                    exclude: 'edu/wpi/**'
+            )
+        }))
+    }
 }