adding REST API specification: api, os, jvm

Specification are defined as JSON, base on Swagger format
https://github.com/wordnik/swagger-core/wiki
These are specs only, no backend implementation yet

Signed-off-by: tzach <tzach.livyatan@gmail.com>
Signed-off-by: Or Cohen <orc@fewbytes.com>
Update the jvm API to be more verbose

Adding modelse for Ballon related infomration and Memory Manager related infomration

Signed-off-by: Tzach Livyatan <tzach@cloudius-systems.com>
Signed-off-by: Or Cohen <orc@fewbytes.com>