provide livereload 'r' (restart option) to reload from root of app in CLI 3.x

CLI 3.x dropped the hot key command in terminal 'r' to perform the live reload from the root of the app (location.hash = ""). A live reload of the current page, resulting from a change to watched file, can leave the app in an consistent state thus requiring full reload. We need an option to restart the app at the root. I find the loss of this feature to be most problematic for Ionic v1 projects.

**Steps to Reproduce:**

1. ionic serve | ionic run --lc ios | or any other live reload command
2. navigate into your app so not at root page
3. touch a watched file
4. app reloads at current page (location.hash preserved)

**Output:**

CLI has no hot key 'r' to restart the from the root URL (location.hash=""). My work around is to type location.hash="" into the browser debugger.

Bumming.

**My `ionic info`:**

global packages:

@ionic/cli-plugin-proxy : 1.3.2
@ionic/cli-plugin-proxy : 1.3.2
@ionic/cli-utils : 1.5.0
Cordova CLI : 7.0.1
Gulp CLI : not installed globally
Ionic CLI : 3.5.0

local packages:

@ionic/cli-plugin-cordova : 1.4.1
@ionic/cli-plugin-gulp : 1.0.2
@ionic/cli-plugin-ionic1 : 2.0.1
Cordova Platforms : android 6.0.0 ios 4.4.0
Ionic Framework : ionic1 1.3.3

System:

Node : v7.4.0
OS : macOS Sierra
Xcode : Xcode 8.3.3 Build version 8E3004b
ios-deploy : 1.9.0
ios-sim : 5.0.13
npm : 4.1.1

**Other Information:**

Comece com o comando de live-reload do Ionic CLI e seu tratamento de teclas de atalho no terminal; em seguida, reproduza o comportamento com `ionic serve`, navegando para fora da rota raiz e alterando um arquivo monitorado. A alteração estará concluída quando uma ação `r` recarregar o app com `location.hash` limpo e o comportamento existente de live-reload permanecer intacto.

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