leapmotion/autowiring — pull request #255 by jnguyen75 (2014-12-11 00:33:17+00:00)
Title: Feature Default Keys for AutoParameter

Created `DefaultKey` and `DefaultMinMaxKey` base classes to be used as the `TKey` for `AutoParameter`. Users should be able to easily define keys like so:

```c++
// integer param that defaults to 15
struct MyDefaultKey : DefaultKey {};
AutoParameter param1;

// integer param that defaults to 15 and must fall within 10 and 20
struct MyDefaultMinMaxKey : DefaultMinMaxKey {};
AutoParameter param2;
```