Load and store Optimizations as YAML.

refs #31
- Introduces custom BeanSerializer using SnakeYAML
- Removed previous json package
- Introduces eva2.yaml package
- Hidden properties are not saved
- Reintroduces output in text window

.gitignore

@@ -1,6 +1,7 @@
 /build/
 out/
 *.ser
+*.yml
 .settings/
 .project
 .classpath