added WIP disclaimer (#6)

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 A tool for running Apache Fluo applications in Hadoop YARN.
+**This is currently a work in progress that depends on unreleased features of Fluo and will not be ready for use until after Fluo 1.2.0 is released.**  Sometime after Fluo 1.2.0 is released this project will make its first release.
 ## Requirements
 The Fluo YARN launcher requires [Apache Fluo][Fluo] and [Hadoop YARN][YARN]: