Add gigalixir service. (#103)

* Add gigalixir service.
* ask user for fqdn since it is simpler than asking for the subdomain.
* make it just like heroku
* update instructions

Co-authored-by: Ole Michaelis <Ole.Michaelis@googlemail.com>

services/gigalixir/config.json

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+{
+  "config": {
+    "name": "gigalixir",
+    "label": "Gigalixir",
+    "description": "Use Gigalixir as your web host.",
+    "category": "infrastructure"
+  },
+  "fields": [
+    {
+      "name": "apexdomain",
+      "label": "Gigalixir Apex App Name",
+      "description": "Your Gigalixir Apex DNS name.",
+      "example": "example.com.gigalixirdns.com"
+    },
+    {
+      "name": "wwwdomain",
+      "label": "Gigalixir WWW App Name",
+      "description": "Your Gigalixir WWW DNS name.",
+      "example": "www.example.com.gigalixirdns.com"
+    }
+  ],
+  "records": [ 
+    {
+      "type": "ALIAS",
+      "content": "{{apexdomain}}",
+      "ttl": 3600
+    },
+    {
+      "name": "www",
+      "type": "CNAME",
+      "content": "{{wwwdomain}}",
+      "ttl": 3600
+    }
+  ]
+}
+

services/gigalixir/instructions.md

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+You must also add your custom domain to your gigalixir app with 
+`gigalixir domains:add www.{{domain}}`
+`gigalixir domains:add {{domain}}`
+

services/gigalixir/readme.md

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+Elixir's Platform-as-a-Service. The only platform that fully supports Elixir.