Remove //y20*/prime

They were packages which each had a single rule and no source files.

Change-Id: Ic9a6f1764ae42eb773af4f5c1ba882bd4cd926d2
diff --git a/y2015/BUILD b/y2015/BUILD
index b2b4ead..db8c331 100644
--- a/y2015/BUILD
+++ b/y2015/BUILD
@@ -1,7 +1,8 @@
-package(default_visibility = ['//visibility:public'])
+load('/aos/downloader/downloader', 'aos_downloader')
 
 cc_library(
   name = 'constants',
+  visibility = ['//visibility:public'],
   srcs = [
     'constants.cc',
   ],
@@ -50,3 +51,21 @@
     '//y2015/actors:fridge_profile_lib',
   ],
 )
+
+aos_downloader(
+  name = 'download',
+  start_srcs = [
+    '//aos:prime_start_binaries',
+    '//y2015/control_loops/drivetrain:drivetrain',
+    '//y2015/control_loops/fridge:fridge',
+    '//y2015/control_loops/claw:claw',
+    '//y2015/autonomous:auto',
+    ':joystick_reader',
+    '//y2015/http_status:http_status',
+    '//y2015/actors:binaries',
+    '//y2015/wpilib:wpilib_interface',
+  ],
+  srcs = [
+    '//aos:prime_binaries',
+  ],
+)