(#33) Add the cache expiration property and set a default value.

Oh, it's a my falut... :sweat: 
I didn't know default cache expiration time is zero and cache didn't work then.
So, I add a cache expiration property to TrimouViewResolver, and set default value.
You can see working example at this repository.
https://github.com/Pitzcarraldo/spring-mustache-hogan-example/tree/trimou
Thank you.