Migrate to Polymer 3.x

[pranavpandey]

Migrated to Polymer 3.x code structure and converted HTML files to their corresponding JavaScript version.

• Added package.json.
• Ran through modulizer.
• Fixed google-apis imports.
• Removed bower.json, please comment if required.

I have updated the tests imports but some are failing at my end due to connection timeout.
Please check and proceed accordingly.

Currently, I am using it in my personal website. Sources are available here.

[elynch303]

can we merge this or is there a way to get this form npm ?

[elynch303]

for now i will just checkout the branch thanks

[burakhanalkan]

Is there any planned due date for this PR to be accepted? Version 2 is based on HTML imports and it would be handy to use a newer version while developing Polymer 3 or lit-element components which supports ES6 module import.