fix(examples): correct import statement for scss example
fix(examples): correct import statement for scss example

 - the example on the main page incorrectly told users to @import "node_modules/ng2-material/all" instead of source/all.
 - closes #17

Q-Free-OpenRoads/ng2-material,mailiam/ng2-material,mailiam/ng2-material,mailiam/ng2-material,parmalatinter/ng2-material,Q-Free-OpenRoads/ng2-material,paulussup/ng2-material,Q-Free-OpenRoads/ng2-material,paulussup/ng2-material,parmalatinter/ng2-material,paulussup/ng2-material,parmalatinter/ng2-material,dmacfarlane/ng2-material,dmacfarlane/ng2-material,Q-Free-OpenRoads/ng2-material,dmacfarlane/ng2-material