test for Julia 0.6 failed

[xiuliren]

I get some error locally.

WARNING: Method definition warn(Any...) in module Base at util.jl:585 overwritten in module 
Logging at /usr/people/jingpeng/.julia/v0.6/Logging/src/Logging.jl:115.                     
WARNING: Method definition info(Any...) in module Base at util.jl:532 overwritten in module 
Logging at /usr/people/jingpeng/.julia/v0.6/Logging/src/Logging.jl:115.                     
ERROR: LoadError: LoadError: MethodError: no method matching override_info(::Logging.LogLeve
l)                                                                                          
Closest candidates are:                                                                     
  override_info(; args...) at /usr/people/jingpeng/.julia/v0.6/Logging/src/Logging.jl:143   
Stacktrace:                                                                                 
 [1] include_from_node1(::String) at ./loading.jl:576                                       
 [2] include(::String) at ./sysimg.jl:14                                                    
 [3] include_from_node1(::String) at ./loading.jl:576                                       
 [4] include(::String) at ./sysimg.jl:14                                                    
 [5] process_options(::Base.JLOptions) at ./client.jl:305                                   
 [6] _start() at ./client.jl:371