change package name and sbt project name to rocket

rocket/src/main/scala/ctrl.scala

@@ -1,4 +1,4 @@
-package Top {
+package rocket
 
 import Chisel._
 import Node._;
@@ -816,5 +816,3 @@ class rocketCtrl extends Component
 
   io.ext_mem.resp_nack:= mem_reg_ext_mem_val && !wb_reg_ext_mem_nack && (io.dmem.req_kill || io.dmem.resp_nack || Reg(!io.dmem.req_rdy))
 }
-
-}