Replace any fonts URL on build

[Toilal]

In distribution, fonts coming from bower dependencies are copied into dist/fonts directory by the fonts task.

Problem is that CSS can reference those fonts. There are some hardcoded cases based on frameworks supported by the generator, but it won't work for other libraries that user can add to bower later.

Using a regex in $.replace call, it will fix any bower_components fonts url and be consistent with fonts task from build.js.

[Toilal]

There's something wrong with the replacement, it's still a work in progress ...

[Toilal]

OK, i've change regexp to be stronger, should be ok now ! It works in my use case using bootstrap.

[Swiip]

I reopen this. Your solution seems great. I'm willing to merge this but you have to rebase it.