Amazon is now triggered internally, which can add extra information for  better results.
Merge pull request #310 from duckduckgo/yegg/amazon-trigger-internally

Amazon is now triggered internally, which can add extra information for ...
Just a basic test needed now.
Merge pull request #311 from duckduckgo/yegg/fix-amazon-test

Just a basic test needed now.
Merge remote-tracking branch 'upstream/master'