updated compilation/configuring instructions

Documentation/Compilation.md

-Configuring and compilation:
+# Configuring and compilation
 
-Install the latest non-beta arduino software IDE/toolset
-   http://www.arduino.cc/en/Main/Software
-
-Download the Marlin firmware
-   https://github.com/MarlinFirmware/Marlin/tree/development
-   
-   For the latest development, or 
-   
-   
-   
-   For the latest stable release
-   
-   In both cases use the "Download Zip" button on the right.
-
-For some spec. boards a spec. dir in the ArduinoAddons directory in the Marlin dir needs to be copied to the arduino environment. <arduino home>\hardware\
-
-Start the arduino IDE.
-Select Tools -> Board -> Arduino Mega 2560    or your microcontroller
-Select the correct serial port in Tools ->Serial Port
-Open Marlin.pde or .ino
-
-Click the Verify/Compile button
-
-Click the Upload button
-If all goes well the firmware is uploading
+  1. Install the latest non-beta arduino software IDE/toolset: http://www.arduino.cc/en/Main/Software
+  2. Download the Marlin firmware
+    - [Latest developement version](https://github.com/MarlinFirmware/Marlin/tree/Development)
+    - [Stable version](https://github.com/MarlinFirmware/Marlin/tree/Development)
+  3. In both cases use the "Download Zip" button on the right.
+  4. Some boards require special files and/or libraries from the ArduinoAddons directory. Take a look at the dedicated [README](/ArduinoAddons/README.md) for details.
+  5. Start the arduino IDE.
+  6. Select Tools -> Board -> Arduino Mega 2560    or your microcontroller
+  7. Select the correct serial port in Tools ->Serial Port
+  8. Open Marlin.pde or .ino
+  9. Click the Verify/Compile button
+  10. Click the Upload button. If all goes well the firmware is uploading
 
 That's ok.  Enjoy Silky Smooth Printing.