NameNode Analytics 1.6.4

The eleventh release of NameNode Analytics.

This is a quick maintenance release to 1.6.3 that addresses the following:
[#243] File type histogram not detecting app logs
[#237] FileTypeHistogram not detecting part files
[#209] Add an [Explain] button for Totals

If you do not need any of the fixes above then do not be concerned.
Feel free to remain on 1.6.3.

Supported OS:
-CentOS/RedHat
-Ubuntu

Supported Java:
-JDK8+

Documentation here: https://nnanalytics.readthedocs.io/en/release-1.6.4/