libimobiledevice/libplist — pull request #40 by aburgh (2014-08-17 00:35:35+00:00)
Title: Enable class objects to have const references

Add const qualifier to copy constructors, Clone(), and Set(). Also added a Set() to Dictionary that takes a reference instead of a pointer. These changes allow these examples to work:

```C++
String s("hello, world"); // the string is a const char, but String doesn't have a const initializer

Dictionary dict;
dict.SetValue("key", String("value"); // The temporary String object is a const type

void func(const String& s) { // this may be OK...
s.Clone(); // ...but no methods are usable since they are not declared const.
}
```