Automated build and added ps script to clean dnx packages

CleanPackages.ps1

@@ -0,0 +1,7 @@
+#enable verbose mode
+$VerbosePreference = "Continue";
+
+[String]$dnxRoot = [System.Environment]::ExpandEnvironmentVariables('%USERPROFILE%\.dnx');
+
+rm -r $dnxRoot\packages -Force 
+

build.cmd

@@ -2,8 +2,9 @@
 
 call "%VS140COMNTOOLS%\VsDevCmd.bat"
 SET ProjectName=Msbuild.All
-REM Set the configuration to either release or debug based on the requirement.
+REM Set the configuration to either release or debug based on the requirement. Accepts this as a parameter to build.cmd. By default it is chosen to be Release.
 SET Configuration=Release
+if NOT "%1"=="" (SET Configuration=%1)  
 SET Platform=Any CPU
 SET NugetOrg_Feed=https://www.nuget.org/api/v2/
 SET IsOfficialBuild=False