Add Heap class to HPPC [HPPC-89]

[dweiss]

I've implemented a heap class for HPPC, and I want to get it merged into the official project.

It's available at https://github.com/picomancer/hppcheap

The hard part's finished – it's written and seems to be working. The code is very clean license-wise (I own all rights since I wrote it completely from scratch).

Unit tests and integration with the project's Maven build system would be nice things to have before a merge. I don't think I want to take responsibility for either of those tasks, so if you're reading this, feel free to start right away :)

Thanks!

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Issue: HPPC-89 (migrated from JIRA), created by Benjamin Johnson

[dweiss]

Comment by Dawid Weiss (@dweiss) (migrated from JIRA)

Thanks Benjamin! Unit tests would be a must before the pull request can be accepted... It'd be great if you spent some time on adding this.