acu134044 clean up Gemfile and gemspec significantly; remove circular dependency between gemspec and Gemfile.
acu134044 fix a broken feature
acu134044 pend SaxParser spec unless libxml-ruby is available.
acu134044 remove more cruft from the gemspec
acu134044 re-add libxml-ruby and activesupport, with suitable safeguards to protect Windows.
Merge remote-tracking branch 'origin/teal_13_17_acu134044_support_mingw'

Conflicts:
	Gemfile
	Gemfile.lock