Implement Key-Value Storage

Implement Key-Value Storage . added test data. Implement key value
interface methods and its implementation.
In-Memory Lookups

Add the cache class for In-Memory Lookups
Updated key-value storage

Key-Value Storage implementation using Multiple Lineage Columns
Key-Value storage

added tests to key-value storage
Key-Value with  Multiple Lineage Columns

Key-Value implementation with  Multiple Lineage Columns as describes in
roadmap.md is complete.
A logical  bug

A logical bug in test
Merge branch 'master' of https://github.com/FaqirAamir/SimpleGameServer into FaqirAamir-master-master

Conflicts:
	Notes/Roadmap.md