Added release notes for v1.4.4.

Author: seidewitz

org.modeldriven.fuml/doc/release-notes/fuml-1.4.4.md

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+### fUML Reference Implementation
+### v1.4.4 Release Notes
+
+This is a production release of the fUML Reference Implementation, tracking the issue resolutions approved in Ballot #4 of 
+the fUML 1.5 Revision Task Force (RTF).
+
+### fUML Execution Engine
+
+The current base release of the fUML Execution Engine is v1.4.0 (see the [v1.4.0 Release Notes](./fuml-1.4.0.md)), 
+conforming to v1.4 of the [fUML Specification](http://www.omg.org/spec/FUML/1.4).
+The v1.4.4 tracking release includes implementation of resolutions to the following OMG issues, which have
+been approved by the fUML Revision Task Force for fUML 1.5 but have not yet been formally adopted.
+
+The full list of open fUML issues is available at http://issues.omg.org/issues/task-force/FUML15.
+
+[FUML 15-2](https://issues.omg.org/issues/FUML15-2) The fUML subset should support the raising and handling of exceptions
+
+[FUML 15-12](https://issues.omg.org/issues/FUML15-12) fUML should include streaming
+
+### XMI Loader/Infrastructure
+
+There are no changes to the XMI Loader in this release.
+
+#### Bug Fixes
+
+None
+
+#### Improvements
+
+None