Multiple providers and dynamic configuration

[mariuszkochanowski]

This adds ability to:

1. use multiple file providers (also embedded file provider)
2. use dynamic confguration like:

<script type="text/javascript" src="~/Scripts1/Script1.js" asp-append-version="true" asp-bundle-key="bundle1"></script>
<script type="text/javascript" src="~/Scripts2/Script2.js" asp-append-version="true" asp-bundle-key="bundle1"></script>
<script type="text/javascript" src="~/js/Script3.js" asp-append-version="true" asp-bundle-key="bundle1"></script>
<script type="text/javascript" src="~/EmbeddedResourcesScripts/EmbeddedScript1.js" asp-append-version="true" asp-bundle-key="bundle1"></script>
<script type="text/javascript" src="~/EmbeddedResourcesScripts/Scripts/EmbeddedScript2.js" asp-append-version="true" asp-bundle-key="bundle1"></script>

<script type="text/javascript" asp-bundle-dest-key="bundle1"></script>

I added tag helpers that inherit from the built-in mvc helpers so you can use them interchangeably:

• configuration "enableTagHelperBundling": true
  renders one file with appended file version
• configuration "enableTagHelperBundling": false
  renders all files separately with own file versions

Take a look at sample WebOptimizer.Core.Sample2

[madskristensen]

Looks awesome. Thank you!!