v0.4.0 - Base version

This version can be considered the base version of which we will work on improving both the API and performance upon, and contains the work of Andrew Werner originally available at: https://github.com/ajwerner/tdigestc.

This implementation is a descendent of Ted MergingDigest, available at: https://github.com/tdunning/t-digest/

Apart from the forked code, this version includes:

Features

• Enabled vec report flags on profile build for clang, gcc, and icc @filipecosta90 (#3)
• Add the ability to change the T-Digest allocator at compile time. @filipecosta90 (#4)
• Added perf record/report automation to makefile @filipecosta90 (#2)
• Fixed remote and added testing documentation. @filipecosta90 (#1)