Update CMakeLists.txt

Now ENABLE_DCASGD is OFF by default.

CMakeLists.txt

@@ -6,7 +6,7 @@ OPTION(USE_HDFS "won't use hdfs on default, set ON to enable" OFF)
 OPTION(TEST "Build all tests." ON)
 OPTION(USE_ZMQ "weather to build with ZeroMQ.(default: OFF)" OFF)
 OPTION(INSTALL_MULTIVERSO "whether install Multiverso to /usr/local/lib" ON)
-option(ENABLE_DCASGD "Build with DC-ASGD supported" ON)
+option(ENABLE_DCASGD "Build with DC-ASGD supported" OFF)
 
 find_package(MPI REQUIRED)