Fix build.cmd to use paket

build.cmd

@@ -1,3 +1,37 @@
 @echo off
-.nuget\nuget.exe install FAKE -OutputDirectory packages -ExcludeVersion
-packages\FAKE\tools\FAKE.exe build.fsx %*
+
+if not exist .paket\paket.bootstrapper.exe goto pktbootnotfound
+.paket\paket.bootstrapper.exe
+if not errorlevel 0 goto pktbootfailed
+
+.paket\paket.exe restore
+if not errorlevel 0 goto pktrestorefailed
+
+packages\FAKE\tools\FAKE.exe %* --fsiargs -d:MONO build.fsx 
+if not errorlevel 0 goto fakefailed
+
+set exit_code=0
+goto leave
+
+:pktbootnotfound
+echo command not found: .paket\paket.bootstrapper.exe
+set exit_code=1
+goto leave
+
+:pktbootfailed
+echo command failed: .paket\paket.bootstrapper.exe
+set exit_code=1
+goto leave
+
+:pktrestorefailed
+echo command failed: .paket\paket.exe restore
+set exit_code=1
+goto leave
+
+:fakefailed
+echo command failed: packages\FAKE\tools\FAKE.exe %* --fsiargs -d:MONO build.fsx 
+set exit_code=1
+goto leave
+
+:leave
+exit /b %exit_code%