Multi-line questions and markdown support

Markdown support is not workable in Meteor UI yet.

And it might be hard to integrate this feature with existing "hide some part of the question if it is too long" feature. Needs thinking and thinking in little app project is hard.

Start by locating the Meteor UI code that renders questions and the existing behavior for hiding part of a long question. Read how question text is currently displayed and determine the interaction between multi-line content, Markdown rendering, and truncation. Done should mean questions support multi-line Markdown without breaking the existing long-question behavior.

Written by the indexing model from the issue text.