teal_13_17_acu134044_fixes_for_right_link_specs

@szmyd more better exception handling for async popen calls
handled user environment hashes that contain non-string values in mingw (legacy behavior for linux and mswin)
handled invalid executable path by raising ENOENT
removed version.rb due to architect objection to .gemspec having to load a lib file
more specs
v2.0.2