Merge pull request #187 from techaddict/math

Added functions to java.lang.Math
Fix #183: Add Thread.currentThread() to support Future.flatMap.
Merge pull request #193 from sjrd/fix/issue-183-future-flatmap

Fix #183: Add Thread.currentThread() to support Future.flatMap.
Merge pull request #191 from techaddict/test

Add java.lang.Math.cbrt().