Modifying puts to logging
assign doctitle to title attribute for AsciiDoc files

- also switch to single quotes where interpolation is not used
Merge remote-tracking branch 'origin/master'

Conflicts:
	lib/awestruct/handlers/asciidoctor_handler.rb
Merge commit 'refs/pull/236/head' of github.com:awestruct/awestruct

Conflicts:
	spec/asciidoc_handler_spec.rb