Separate *.less files by social network

[vitorbaptista]

This would be useful for many users of the directive, as we usually don't want to add every social network which angular-social supports. The way the *.js are organized already allow me to do that (I can get just twitter and facebook, for example), but not the *.less.

As the compiled CSS isn't small (22 KB), it's quite important IMHO.

What do you think?

[vitorbaptista]

My fault, just found them 👍