[L4] Support Bootstrap 3 inline checkbox and radio.

With the help of CSS classes checkbox-inline and radio-inline.
Should fix #248
Removed a short array syntax use as Former is PHP 5.3+
Tidying up pull request.

Many thanks to Anahkiasen :)
Use parent inline class as default value in TwitterBootstrap3::getInlineLabelClass()
Merge pull request #255 from tortuetorche/patch-1

[L4] Support Bootstrap 3 inline checkbox and radio.