create read method for using nokogiri or opengraph
fix wikipedia spec b/c changed engine
change example engine and rspec to use read method
use read method for amazon, qik, and stackexchange oneboxes
fix specs for amazon, qik, and stackexchange oneboxes b/c changed engine
move duplicate behavior to engine module
Merge pull request #47 from dysania/parse-opengraph

DRYing Engine Code