generate line-number comments that work with FireSass

[DallanQ]

If you change the form of the line number comments in the generated css file from

/* line , */

to

@media -sass-debug-info{filename{font-family:file:}line{font-family:\0}}

then the line numbers will show up in firebug using the FireSass plugin.

To enable this, all you have to do is change line 108 of Engine.java from

options[:line_comments]

to

options[:debug_info]