Add guide for library creation (#2219)
Add guide for library creation (#2219)

* Update:
* Resolve issue with `.scss` source maps.

* * Readme update, add link for library creation for Angular Seed.

pieczkus/whyblogfront,hookom/climbontheway,JohnnyQQQQ/angular-seed-material2,mgechev/angular-seed,vyakymenko/angular-seed-express,hookom/climbontheway,mgechev/angular-seed,hookom/climbontheway,vyakymenko/angular-seed-express,mgechev/angular2-seed,vyakymenko/angular-seed-express,pieczkus/whyblogfront,JohnnyQQQQ/angular-seed-material2,mgechev/angular2-seed,mgechev/angular-seed,hookom/climbontheway,mgechev/angular2-seed,JohnnyQQQQ/angular-seed-material2,pieczkus/whyblogfront