fix: Function App ingredient (#56)

ingredient/ingredient-function-app/.npmignore

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+src/
+.vscode/
+package/
+test/

ingredient/ingredient-function-app/CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file.
+See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
+
+## [0.1.21](https://github.com/csperbeck/azure-bake/compare/v0.1.5...v0.1.21) (2019-02-15)
+
+**Note:** Version bump only for package

ingredient/ingredient-function-app/README.md

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+## Changelogs
+* [@azbake/ingredient-function-app](./CHANGELOG.md)
+
+## Overview
+
+The Function App ingredient is a plugin for Bake. When included in a recipe, this will create a standard function app for organizing a number of Azure Functions. This ingredient depends on a hosting plan, a Storage account, and an Application Insights resource to be provisioned already, and the names of these resources must be included in the recipe.
+
+## Usage
+
+### Recipe
+```yaml
+name: My package
+shortName: mypkg
+version: 1.0.0
+ingredients:
+  - "@azbake/ingredient-function-app@~0"
+resourceGroup: true
+rgOverride: "resourcegroup1"
+parallelRegions: false
+recipe:
+  funcapp:
+    properties:
+      type: "@azbake/ingredient-function-app"
+      parameters:
+        appName: "[functionapputils.create_resource_name()]"
+        planName: "hostingplan2"
+        storageAccountName: "storageaccount3"
+        appInsightsName: "appInsights4"
+```
+
+| property|required|description|
+|---------|--------|-----------|
+| appName | yes | Name for the function app resource |
+| planName | yes | Specifies the hosting plan to use for this function app. |
+| storageAccountName | yes | The Storage account to use. It should be able to support the Always On feature for function apps |
+| appInsightsName | yes | The Application Insights resource that this function app will report to |
+| location | no |The location for this resource. Default is the parent resource group geographic location |
+
+For hosting plan, storage account, or application insights, indicate the the resource groups they belong to if the function app will be in a different group. Use the following format to specify resource groups. If a resource group is not indicated, it will look for the resources in the same group that the function app is targeting.  
+``<resource_group>/<resource_name>``
+
+## Utilities
+
+Utility classes can be used inside of the bake.yaml file for parameter and source values.
+
+### ``functionapputils`` class
+
+|function|description|
+|--------|-----------|
+|create_resource_name()| Creates a name for the function app in the format ``<environment_name><region_code>fa<pkg_shortname>``.|
+
+### Function Details
+
+#### create_resource_name()
+Creates a name for the function app in the format ``<environment_name><region_code>fa<pkg_shortname>``
+
+```yaml
+...
+parameters:
+  appName: "[functionapputils.create_resource_name()]"
+...
+```
+#### Returns
+string