Commits on Nov 22, 2017

1. Fix compilation for custom resources dynamic vsn …

   The Erlang compiler runs based on a global state built from currently
   loaded libraries and the configured code path that is available. For
   this reason, the rebar3 compiler job unloads all plugin paths before
   calling the Erlang compiler.
   
   However, this causes a problem when an application uses a custom
   resource handler with a dynamic version in their .app.src file since the
   plugin that can be used to find the version has been unloaded.
   
   Fortunately, the compile phase that runs the version handling is
   distinct from the phase that uses the Erlang compiler. This patch fixes
   the problem by re-loading the plugins' paths in memory before generating
   the .app file, and before unloading them afterwards.
   
   It appears that unloading them is unnecessary because the hooks after
   that will re-load them, but it is likely better to play it safe with
   that global state and clean up after ourselves. It offers better
   protection for future changes.
   
   Fixes erlang#1657

   

   ferd committed Nov 22, 2017
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