[Huge] Util Refactor, Dashboard Improvements, Hass.io Auth API, Better Validation Errors, Conditions, Custom Platforms, Substitutions (#234)

* Implement custom sensor platform

* Update

* Ethernet

* Lint

* Fix

* Login page

* Rename cookie secret

* Update manifest

* Update cookie check logic

* Favicon

* Fix

* Favicon manifest

* Fix

* Fix

* Fix

* Use hostname

* Message

* Temporary commit for screenshot

* Automatic board selection

* Undo temporary commit

* Update esphomeyaml-edge

* In-dashboard editing and hosting files locally

* Update esphomeyaml-edge

* Better ANSI color escaping

* Message

* Lint

* Download Efficiency

* Fix gitlab

* Fix

* Rename extra_libraries to libraries

* Add example

* Update README.md

* Update README.md

* Update README.md

* HassIO -> Hass.io

* Updates

* Add update available notice

* Update

* Fix substitutions

* Better error message

* Re-do dashboard ANSI colors

* Only include FastLED if user says so

* Autoscroll logs

* Remove old checks

* Use safer RedirectText

* Improvements

* Fix

* Use enviornment variable

* Use http://hassio/host/info

* Fix conditions

* Update platformio versions

* Revert "Use enviornment variable"

This reverts commit 7f038eb5d26df72f76ea9ae76774e2cec1fd7f59.

* Fix

* README update

* Temp

* Better invalid config messages

* Platformio debug

* Improve error messages

* Debug

* Remove debug

* Multi Conf

* Update

* Better paths

* Remove unused

* Fixes

* Lint

* lib_ignore

* Try fix platformio colors

* Fix dashboard scrolling

* Revert

* Lint

* Revert

tests/test2.yaml

@@ -1,15 +1,16 @@
 esphomeyaml:
-  name: test2
+  name: $devicename
   platform: ESP32
   board: nodemcu-32s
-  # Use latest upstream esphomelib git version.
-  esphomelib_version: dev
   # Use this for testing while developing:
   # esphomelib_version:
   #   local: ~/path/to/esphomelib
   use_custom_code: true
   build_path: build/test2
 
+substitutions:
+  devicename: test2
+
 wifi:
   ssid: 'MySSID'
   password: 'password1'
@@ -150,7 +151,7 @@ text_sensor:
     icon: mdi:icon
     id: version_sensor
     on_value:
-      - lambda: |-
+      - lambda: !lambda |-
           ESP_LOGD("main", "The state is %s=%s", x.c_str(), id(version_sensor).state.c_str());
       - script.execute: my_script
   - platform: mqtt_subscribe