Refactor API.
fix the interface setup, update tests
lots of changes, updated README
replace ParseEx with variadic ParseWithDirect
fixed relative url test
fix README typos
move relevant bits of README into code comments
Switch SearchEngines to a map
fixed README example
make internal referrer fields private
add the example to the test suite, add package level blurb
add example for ParseWithDirect
final comment tweaks
Merge pull request #2 from Shopify/refactor_api

Refactor API