Add web-component-tester 0.6.2

Also cleans up the tests being ignored.
Add .gitignore file & ignore node_modules
Add Gulp file and package.json for deps
Revise index.html to use web-component-tester
Refactor basic tests to use wc tester.
Drop unnecessary tests.html
Merge pull request #29 from PolymerLabs/wc-tester

Switch to using web-component-tester