Update xUnit runner to netstandardapp1.5

This was enabled in dotnet/coreclr.xunit#12

test/csharp/project.json

@@ -5,13 +5,12 @@
     "authors": [ "andschwa" ],
 
     "dependencies": {
-	"Microsoft.PowerShell.Linux.Host": "1.0.0-*",
-	"System.IO.Compression": "4.0.1-rc3-23903"
+	"Microsoft.PowerShell.Linux.Host": "1.0.0-*"
     },
 
     "frameworks": {
-	"dnxcore50": {
-	    "imports": [ "netstandardapp1.5", "portable-net45+win8" ],
+	"netstandardapp1.5": {
+	    "imports": [ "dnxcore50", "portable-net45+win8" ],
 	    "dependencies": {
 		"xunit": "2.1.0",
 		"dotnet-test-xunit": "1.0.0-dev-*"

xunit.sh

@@ -22,7 +22,7 @@ pushd test/csharp
 ## Build
 dotnet build
 ## Work-around dotnet/cli#753
-cp -r ../../src/Microsoft.PowerShell.Linux.Host/{Modules,*ps1xml} bin/Debug/dnxcore50/ubuntu.14.04-x64
+cp -r ../../src/Microsoft.PowerShell.Linux.Host/{Modules,*ps1xml} bin/Debug/netstandardapp1.5/ubuntu.14.04-x64
 ## Test
 dotnet test
 popd