How to open Sublime Text via command line (Windows)

- Added mention of Codecademy Labs as an alternative to jsfiddle. I think Codecademy Labs is better for the Project Euler problems because you can use console.log() to print output (console.log() is what 1st section of Javascript track in Codecademy teaches).

- Created a guide for doing some minor hacking to allow you to open Sublime Text via command line in Windows. The info provided is specifically deals with the command prompt shortcut created by the RailsInstaller. Other solutions I found online confused me until I realized they did not account for our special shortcut.

- Added link to installations.md for my guide