Interim Apex can now be installed and launched (on Windows)

lib/common.rb

@@ -15,4 +15,24 @@ class W3DHub
   def self.format_size_number(i)
     format("%0.2f", i)
   end
+
+  def self.windows?
+    RbConfig::CONFIG["host_os"] =~ /(mingw|mswin|windows)/i
+  end
+
+  def self.mac?
+    RbConfig::CONFIG["host_os"] =~ /(darwin|mac os)/i
+  end
+
+  def self.linux?
+    RbConfig::CONFIG["host_os"] =~ /(linux|bsd|aix|solaris)/i
+  end
+
+  def self.unix?
+    linux? || mac?
+  end
+
+  def self.home_directory
+    File.expand_path("~")
+  end
 end