Save and load hash-map data structures to disk in a performant manner

<dependencies>
    ...
    <dependency>
      <groupId>com.dorkbox</groupId>
      <artifactId>Storage</artifactId>
      <version>1.1</version>
    </dependency>
</dependencies>

dependencies {
    ...
    compile "com.dorkbox:Storage:1.0"
}