Serialization
JSON / Swagger
Moved Swagger from JSON to REST frameworks
Added Bytecode Manipulation section with some content.

The ASM, cglib, and Javassist are the three most commonly used libraries for working
with Java bytecode at runtime. They are used by many frameworks and programs to
provide dynamic behavior like AOP programming.
Update README.md

Added few libs under Database and Distributed Applications
Update README.md

Libs in alphabetical order.
Merge pull request #46 from sojin/master

Added few very good libs under Database and Distributed apps
Merge pull request #45 from acisternino/bytecode-manip

Added Bytecode Manipulation section with some content. Maybe remove cglib later on, I think it suffers from inactivity.
Merge pull request #42 from deephacks/serialization

Serialization
Merge pull request #43 from deephacks/json

REST Frameworks / Swagger
Update README.md

Removed
- Bytecode Manipulation > cglib since it is deprecated

Added
- Code Analysis > Checkstyle
- Code Analysis > PMD
Update README.md

Changed some descriptions.