Add fluid container class

[ljpaul]

In addition to the .rvt-container-* that are currently available, adding a .rvt-container-fluid (or just .rvt-container that is fluid) would be a useful addition.

.rvt-container {
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

The only thing removed is the max-width.

[levimcg]

@ljpaul In most cases we would like to encourage people to set a maximum width on their containers since when a screen/browser window gets larger it creates very long line lengths for text and forms which make it much more difficult for users to read/track back and forth.

In your fluid container example above the left and right auto margins aren't doing anything if you truly are wanting a full-width fluid container that fills up the entire width of it's parent. If you need to, you could accomplish this same thing using a spacing utility class. The rvt-p-lr-md class uses the exact same 1.5rem for left and right padding that all or the rvt-container-* classes do.