Enum-keyed maps bad serialization

[aperry5544]

When serializing out a map that uses an enum as the key, the resulting map adds extra escaped quotes around the key name.

Example...

enum class MyEnum
{
    Value0,
    Value1
};

JSONCONS_ENUM_TRAITS(MyEnum, Value0, Value1)

std::map<MyEnum, int> my_map;
my_map[MyEnum::Value0] = 5;
my_map[MyEnum::Value1] = 10;

When serializing my_map it results in the following...

...
"my_map": {
    "\"Value0\"": 5,
    "\"Value1\"": 10
}
...

I would instead expect the output to be

...
"my_map": {
    "Value0": 5,
    "Value1": 10
}
...

[danielaparker]

Thanks for reporting this, fixed on master.