Added distribution files and release notes for 1.5.0a.

Author: seidewitz

org.modeldriven.fuml/dist/fuml-1.5.0a-distribution.zip

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+### fUML Reference Implementation
+
+### v1.5.0a Release Notes
+
+This is a production maintenance release of the fUML Reference Implementation.
+
+### fUML Execution Engine
+
+The current base release for the fUML Execution Engine is v1.5.0, conforming to v1.5.1 of the [fUML Specification](http://www.omg.org/spec/FUML/1.5.1). The v1.5.0a maintenance release builds on the v1.5.0 base release (see the [v1.5.0 Release Notes](./fuml-1.5.0.md)). No further changes to the fUML Execution Engine have been made in this maintenance release.
+
+The full list of open fUML issues is available at https://issues.omg.org/issues/lists/fuml-rtf.
+
+### XMI Loader/Infrastructure
+
+This maintenance release resolves the following issue, as tracked in our issue management system on GitHub (see https://github.com/ModelDriven/fUML-Reference-Implementation/issues).
+
+#### Improvements
+
+[Issue #41](https://github.com/ModelDriven/fUML-Reference-Implementation/issues/41) Support JDKs beyond 8