Removed double line-end at the end of @import insertion

[kamilogorek]

By adding double line-end one's unable to create @imports blocks without manually removing unnecessary spacing.

[kamilogorek]

I think that it's better to leave inserted code in form of:

@import "breakpoint";
@import "compass";
@import "compass-placeholders";

instead of:

@import "breakpoint";

@import "compass";

@import "compass-placeholders";

This will allow us to make imports block at the beginning of a document with ease.