Consolidate frontend (#9915)

* Consolidate frontend

* Remove home-assistant-polymer submodule

* Convert to using a pypi package for frontend

* fix release script

* Lint

* Remove unused file

* Remove frontend related scripts

* Move hass_frontend to frontend REQUIREMENTS

* Fix tests

* lint

* Address comments

* Lint + fix tests in py34

* Fix py34 tests again

* fix typo

.gitmodules

@@ -1,3 +0,0 @@
-[submodule "homeassistant/components/frontend/www_static/home-assistant-polymer"]
-	path = homeassistant/components/frontend/www_static/home-assistant-polymer
-	url = https://github.com/home-assistant/home-assistant-polymer.git