Mixin support using ASM
- Mixin transformer
- Added example mixin and example mixin configuration
Added comments and fixed minor derp when applying transformers to mixins
Adding Overwrite annotation and additional mixin examples
Fix NPE in getAnnotationValue in ASMHelper
Add "prefix" functionality to Shadow annotation, fixes md overlap issue
Minor checkstyle fixes
Merge pull request #61 from SpongePowered/feature/mixins

Feature/mixins