Cleaned up, added nosteam functionality and force validation when steam servers are down.

AMBuilder

@@ -17,7 +17,7 @@ project.sources += [
 for sdk_name in SM.sdks:
   sdk = SM.sdks[sdk_name]
 
-  binary = SM.HL2Config(project, projectName + '.ext.' + sdk.ext, sdk)
+  binary = SM.HL2Config(project, projectName + '.ext', sdk)
   binary.compiler.cxxincludes += [
     os.path.join(SM.sm_root, 'public', 'extensions'),
     os.path.join(SM.sm_root, 'public', 'sourcepawn'),