Added nuspec files so MyGet can build and publish NuGet packages

nuget/MyGet.ps1

+$nuget = $env:NuGet
+
+#parse the version number out of package.json
+$bsversion = ((Get-Content $env:SourcesPath\package.json) -join "`n" | ConvertFrom-Json).version
+
+#create packages
+& $nuget pack "nuget\bootstrap.nuspec" -Verbosity detailed -NonInteractive -NoPackageAnalysis -BasePath $env:SourcesPath -Version $bsversion
+& $nuget pack "nuget\bootstrap.less.nuspec" -Verbosity detailed -NonInteractive -NoPackageAnalysis -BasePath $env:SourcesPath -Version $bsversion
\ No newline at end of file

nuget/bootstrap.nuspec

+<?xml version="1.0"?>
+<package xmlns="http://schemas.microsoft.com/packaging/2011/08/nuspec.xsd">
+  <metadata>
+    <id>bootstrap</id>
+    <version>4.0.0-alpha</version>
+    <title>Bootstrap CSS</title>
+    <authors>Twitter, Inc.</authors>
+    <owners>bootstrap</owners>
+	<description>The most popular front-end framework for developing responsive, mobile first projects on the web.</description>
+	<releaseNotes>http://blog.getbootstrap.com</releaseNotes>
+	<summary>Bootstrap framework in CSS. Includes fonts and JavaScript</summary>
+	<language>en-us</language>
+	<projectUrl>http://getbootstrap.com</projectUrl>
+    <iconUrl>http://getbootstrap.com/apple-touch-icon.png</iconUrl>
+	<licenseUrl>https://github.com/twbs/bootstrap/blob/master/LICENSE</licenseUrl>
+    <copyright>Copyright 2015</copyright>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <dependencies>
+      <dependency id="jQuery" version="2.0.0" />
+    </dependencies>
+	<tags>css js less mobile-first responsive front-end framework web</tags>
+  </metadata>
+  <files>
+    <file src="dist\css\*.*" target="content\Content" />
+    <file src="dist\js\bootstrap*.js" target="content\Scripts" />
+  </files>
+</package>
\ No newline at end of file

nuget/bootstrap.sass.nuspec

+<?xml version="1.0"?>
+<package xmlns="http://schemas.microsoft.com/packaging/2011/08/nuspec.xsd">
+  <metadata>
+    <id>bootstrap.sass</id>
+    <version>4.0.0-alpha</version>
+    <title>Bootstrap Sass</title>
+    <authors>Twitter, Inc.</authors>
+    <owners>bootstrap</owners>
+	<description>The most popular front-end framework for developing responsive, mobile first projects on the web.</description>
+    <releaseNotes>http://blog.getbootstrap.com</releaseNotes>
+	<summary>Bootstrap framework in Sass. Includes fonts and JavaScript</summary>
+	<language>en-us</language>
+	<projectUrl>http://getbootstrap.com</projectUrl>
+    <iconUrl>http://getbootstrap.com/apple-touch-icon.png</iconUrl>
+	<licenseUrl>https://github.com/twbs/bootstrap/blob/master/LICENSE</licenseUrl>
+    <copyright>Copyright 2015</copyright>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <dependencies>
+      <dependency id="jQuery" version="2.0.0" />
+    </dependencies>
+	<tags>css js less mobile-first responsive front-end framework web</tags>
+  </metadata>
+  <files>
+    <file src="scss\**\*.scss" target="content\Content\bootstrap" />
+    <file src="dist\js\bootstrap*.js" target="content\Scripts" />
+  </files>
+</package>
\ No newline at end of file