Fixing the CNG package to reference specific Erlang version
Adding support for Elixir v0.15.0
Bumped the version number. I found an issue with the original .nuspec due to a ps1~ file getting packaged.  Fixed that and will make sure *.ps1~ files are removed before packaging in future
Changes made to upgrade elixir
Merge pull request #17 from OnorioCatenacci/v0_15_1

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