compatible for julia-0.5.0?

```
Pkg.test("MessageUtils")
INFO: Testing MessageUtils
ERROR: LoadError: LoadError: syntax: space before "(" not allowed in "isdefined ("
in include_from_node1(::String) at ./loading.jl:488
in eval(::Module, ::Any) at ./boot.jl:234
in require(::Symbol) at ./loading.jl:409
in include_from_node1(::String) at ./loading.jl:488
in process_options(::Base.JLOptions) at ./client.jl:262
in _start() at ./client.jl:318
while loading /usr/people/jingpeng/.julia/v0.5/MessageUtils/src/MessageUtils.jl, in expression starting on line 19
while loading /usr/people/jingpeng/.julia/v0.5/MessageUtils/test/runtests.jl, in expression starting on line 4
=======================================[ ERROR: MessageUtils ]========================================

failed process: Process(`/usr/people/jingpeng/lib/julia/bin/julia -Cx86-64 -J/usr/people/jingpeng/lib/julia/lib/julia/sys.so --compile=yes --depwarn=yes --check-bounds=yes --code-coverage=none --color=yes --compilecache=yes /usr/people/jingpeng/.julia/v0.5/MessageUtils/test/runtests.jl`, ProcessExited(1)) [1]

======================================================================================================
ERROR: MessageUtils had test errors
in #test#61(::Bool, ::Function, ::Array{AbstractString,1}) at ./pkg/entry.jl:740
in (::Base.Pkg.Entry.#kw##test)(::Array{Any,1}, ::Base.Pkg.Entry.#test, ::Array{AbstractString,1}) at ./:0
in (::Base.Pkg.Dir.##2#3{Array{Any,1},Base.Pkg.Entry.#test,Tuple{Array{AbstractString,1}}})() at ./pkg/dir.jl:31
in cd(::Base.Pkg.Dir.##2#3{Array{Any,1},Base.Pkg.Entry.#test,Tuple{Array{AbstractString,1}}}, ::String) at ./file.jl:59
in #cd#1(::Array{Any,1}, ::Function, ::Function, ::Array{AbstractString,1}, ::Vararg{Array{AbstractString,1},N}) at ./pkg/dir.jl:31
in (::Base.Pkg.Dir.#kw##cd)(::Array{Any,1}, ::Base.Pkg.Dir.#cd, ::Function, ::Array{AbstractString,1}, ::Vararg{Array{AbstractString,1},N}) at ./:0
in #test#3(::Bool, ::Function, ::String, ::Vararg{String,N}) at ./pkg/pkg.jl:258
in test(::String, ::Vararg{String,N}) at ./pkg/pkg.jl:258
```

after fixing the space issue, got this:

```
ERROR: LoadError: LoadError: LoadError: TypeError: SyncObjRef: in type definition, expected Type{T}, got Base.#RemoteRef
in include_from_node1(::String) at ./loading.jl:488 (repeats 2 times)
in eval(::Module, ::Any) at ./boot.jl:234
in require(::Symbol) at ./loading.jl:409
in include_from_node1(::String) at ./loading.jl:488
in process_options(::Base.JLOptions) at ./client.jl:262
in _start() at ./client.jl:318
while loading /usr/people/jingpeng/.julia/v0.5/MessageUtils/src/core.jl, in expression starting on line 4
while loading /usr/people/jingpeng/.julia/v0.5/MessageUtils/src/MessageUtils.jl, in expression starting on line 5
while loading /usr/people/jingpeng/.julia/v0.5/MessageUtils/test/runtests.jl, in expression starting on line 4
```

```
julia> versioninfo()
Julia Version 0.5.0
Commit 3c9d753 (2016-09-19 18:14 UTC)
Platform Info:
System: Linux (x86_64-pc-linux-gnu)
CPU: Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz
WORD_SIZE: 64
BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Haswell)
LAPACK: libopenblas64_
LIBM: libopenlibm
LLVM: libLLVM-3.7.1 (ORCJIT, haswell)

```