Add rationale for test files
Link to goodie_triggers in the basic tutorial
Link to test_files
Github link instead of Duck.co in goodie_basic
Github link instead of Duck.co in goodie_tests
developer_checklist link to details about html_enc
Merge branch 'master' of https://github.com/DavidMascio/duckduckgo-documentation

Conflicts:
	duckduckhack/testing/goodie_tests.md