fix(Binary): Don't cache PATH
fix(Binary): Don't cache PATH

This was an optimization, and as we know cache invalidation
and premature optimization are evil. Caused hard to find bud when I
needed to update path in the process.

stencila/stencila,stencila/stencila,stencila/stencila,stencila/stencila,stencila/stencila,stencila/stencila,stencila/stencila