Cherry picking fixes from master

- Upgraded library version and updated readme (cherry picked from commit 7dc256d)
- Initial support for nested Lists/Sets and arrays (cherry picked from commit c4e78b7)
- Added support for nested lists/sets and arrays (cherry picked from commit ca483b4)
Getting ready for 0.6.2
[maven-release-plugin] prepare release swagger-springmvc-0.6.2
[maven-release-plugin] prepare for next development iteration
Updated to 0.6.2