add --followonly option

[geddski]

Add option for lessless to only compile the LESS files it finds in html links, instead of the default compiling of all LESS files.

[2m3]

I would even think about making this the default and add a --compileall option instead. Either way, I'm looking forward to seeing this feature implemented. :-)

[scottsd]

+1 This makes lessless unusable when style.less imports a varibles.less and then whatever.less which uses variables, with error that variable isn't defined, because it seems it's trying to independently compile whatever.less