Create different builds of HTML5 Boilerplate?

There was a [discussion](https://github.com/h5bp/html5-boilerplate/issues/1527) in the first part of the year about removing the `.htaccess` file from the project.

I personally think that including some boilerplate server configurations is important, but I do agree that users should have a choice in the matter! So, with this pull request I propose that we slowly move towards providing different builds of HTML5 Boilerplate.

Right now, the changes from this PR will generate two versions:

* `dist/h5bp` (no server configs)
* `dist/h5bp+apache` (Apache server configs)

and also two archives that we [can attache to a release](https://github.com/blog/1547-release-your-software):

![](https://cloud.githubusercontent.com/assets/1223565/4797089/d535d064-5e08-11e4-932d-cb4e695071d7.png)

But in the near future (after `v5`) my hope is that we'll provide also a `nginx` build (already talked with @AD7six about it) and so on.

--

Thoughts? (Cc: @h5bp/html5-boilerplate)

Also, any other ideas are welcomed!