Fix SpaceBeforeBrace bug for single line blocks #94

For issue 94 https://github.com/causes/scss-lint/issues/94 this fixes
the issue with scss-lint ignoring single line blocks such as:

  .single-line-selector{color: #fff;}

Shane - one concern with this is I'm pretty sure this fix breaks the
rule we have at Causes.com that enforces things like:

  p {
  }

vs

  p {}