Modified README.md, Added the SCSS compiler Task, bugs fixed.

[sunil-digicorp]

• Resovled the link issue of "Visit Propeller" in README.md file
• Updated path of "Clone the repo" in README.md file
• Updated the url of "Propeller Guidelines" in README.md file
• Updated the package.json file for the SCSS compilations
• Added the SCSS compiler task with auto watch (grunt dev) in the Grunt file.
• Added the ability to discover the propeller init method calls so that SPA type web apps can initialize the propellerkit externally.
• Solved the issue of "Uncaught RangeError: Maximum call stack size exceeded" in Javascript