Added setting for null value so the template will render a default value rather than throw an exception.
Expose emptyStringIsFalse in MustacheViewResolver
Fixed type assigned to emptyStringIsFalse in setter method of MustacheViewResolver
Updated MustacheViewResolver unit test
Merge pull request #13 from paulespinosa/master

Expose nullValue and emptyStringIsFalse properties through MustacheViewResolver