tree f14b3e01ada51d01312cd40830bf98c05ba84079
parent 6a0947109aebe5b452c29ab479f4ecef72c6e766
author Sergiy Matusevych <motus@apache.org> 1474601936 -0700
committer Julia Wang <jwang98052@yahoo.com> 1475775531 -0700

[REEF-1573] Split REEFLauncher into executable part and the Clock-running environment.

This is work towards [REEF-1561](https://issues.apache.org/jira/browse/REEF-1561) *"REEF as a library"* effort.

Summary of changes:
   * Split REEFLauncher into launcher and REEFEnvironment.
   * Improve error handling in REEFLauncher and around.
   * Fixes in logging and error reporting.
   * Add unit test for local environment driver execution.
   * Minor cosmetic and style fixes.
   * Add comments to explain checkstyle exceptions
   * Add several TODOs and related JIRAs for future work

JIRA: [REEF-1573](https://issues.apache.org/jira/browse/REEF-1573)

This closes #1133