change package name and sbt project name to rocket

rocket/src/main/scala/dpath.scala

@@ -1,4 +1,4 @@
-package Top {
+package rocket
 
 import Chisel._
 import Node._;
@@ -448,5 +448,3 @@ class rocketDpath extends Component
   pcr.io.pc					  := wb_reg_pc;
   pcr.io.badvaddr_wen := io.ctrl.badvaddr_wen;
 }
-
-}