Release 0.8.2

This release adds utility methods for estimating allocated and used memory.

• HPPC-175: Method estimating memory usage (Haoyu Zhai)

Resolved issues:
https://issues.carrot2.org/projects/HPPC/versions/13522
JavaDoc:
http://carrotsearch.github.io/hppc/releases/0.8.2/api