Fixes #51 and #54 to not cull if an image exists in a div without text.
Fixes the double counting proble of #53 when noscript with img is encountered in a div.
Moved constants to the beginning of the file.
Fixes #30 and also adds API to make images FQDN in the resulting readable content.
added specs for fixes
Merge branch 'master' of https://github.com/pagojo/ruby-readability into pagojo-master

Conflicts:
	lib/readability.rb