make tests run a bit on 1.9
fix overwritten tests
bring back is_binary_data for 1.9
fix isutf8 no longer being correct -> less broken tests
Merge remote-tracking branch 'grosser/isutf8'
Merge remote-tracking branch 'grosser/is_binary_data'

Conflicts:
	lib/tmail/quoting.rb
Merge remote-tracking branch 'grosser/tests'