[REEF-1632] Optimize `using` directives

This change:
 * removes unused imports
 * reorders used imports in alphabetical order
 * cleans up `using` specific classes in IMRU FT tests

This change was done using ReSharper's `Cleanup code` tool.

JIRA:
  [REEF-1632](https://issues.apache.org/jira/browse/REEF-1632)

Pull request:
  This closes #1147
162 files changed
tree: d02d3c28287081e2668fa90e0bc1c78ee9596e4d
  1. bin/
  2. dev/
  3. lang/
  4. website/
  5. .gitattributes
  6. .gitignore
  7. .travis.yml
  8. appveyor.yml
  9. Doxyfile
  10. HEADER
  11. LICENSE
  12. NOTICE
  13. pom.xml
  14. README.md
README.md

Apache REEF™

Apache REEF™ (Retainable Evaluator Execution Framework) is a library for developing portable applications for cluster resource managers such as Apache Hadoop YARN or Apache Mesos. For example, Microsoft Azure Stream Analytics is built on REEF and Hadoop.

Online Documentation

Detailed information on REEF can be found in the following places:

The developer mailing list is the best way to reach REEF‘s developers when the above aren’t sufficient.

Build Status

ComponentOSStatus
REEF JavaUbuntuBuild Status
REEF.NETWindowsBuild status

Building REEF

Java.NET
Build & run unit testsjava\BUILD.mdcs\BUILD.md

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License

Apache 2.0