Tight list and attributes

[jgm]

{.outer-style}
* a

  {.inner-style}
  * b
* c

Ideally the use of the "inner-style" attribute wouldn't force the outer list to be loose. (If you remove the {.inner-style} line, the outer list becomes tight, but the presence of attributes shouldn't affect tight/loose calculations like this.)

[vassudanagunta]

My proposal in #201 would solve this conundrum.