Appveyor

[cdunn2001]

re: #242

Test auto appveyor run...

[cdunn2001]

Seems to work! But it takes 1/2 hour.

I guess we should try to fix these someday:

Build succeeded.

"C:\projects\jsoncpp\jsoncpp.sln" (default target) (1) ->
"C:\projects\jsoncpp\ALL_BUILD.vcxproj.metaproj" (default target) (2) ->
"C:\projects\jsoncpp\src\lib_json\jsoncpp_lib_static.vcxproj.metaproj" (default target) (4) ->
"C:\projects\jsoncpp\src\lib_json\jsoncpp_lib_static.vcxproj" (default target) (5) ->
(ClCompile target) -> 
  C:\projects\jsoncpp\src\lib_json\json_value.cpp(128): warning C4267: '=' : conversion from 'size_t' to 'unsigned int', possible loss of data [C:\projects\jsoncpp\src\lib_json\jsoncpp_lib_static.vcxproj]
  C:\projects\jsoncpp\src\lib_json\json_value.cpp(162): warning C4512: 'Json::Exception' : assignment operator could not be generated [C:\projects\jsoncpp\src\lib_json\jsoncpp_lib_static.vcxproj]
  C:\projects\jsoncpp\src\lib_json\json_value.cpp(166): warning C4512: 'Json::RuntimeError' : assignment operator could not be generated [C:\projects\jsoncpp\src\lib_json\jsoncpp_lib_static.vcxproj]
  C:\projects\jsoncpp\src\lib_json\json_value.cpp(170): warning C4512: 'Json::LogicError' : assignment operator could not be generated [C:\projects\jsoncpp\src\lib_json\jsoncpp_lib_static.vcxproj]
  C:\projects\jsoncpp\src\lib_json\json_writer.cpp(349): warning C4267: 'argument' : conversion from 'size_t' to 'unsigned int', possible loss of data [C:\projects\jsoncpp\src\lib_json\jsoncpp_lib_static.vcxproj]
  C:\projects\jsoncpp\src\lib_json\json_writer.cpp(909): warning C4267: 'argument' : conversion from 'size_t' to 'unsigned int', possible loss of data [C:\projects\jsoncpp\src\lib_json\jsoncpp_lib_static.vcxproj]

    6 Warning(s)
    0 Error(s)

@marklakata had a fix for some of those already.