New Post Creation Template changes

Removes old new post creation template and unifies both inline and main application post creation. Includes UI for Question/Discussion post types, help text strings, and a general styling cleanup of this UI. 
Commits will be squashed down after review is complete. 

@gwprice @jimabramson - This still start out the feature branch we can add in all work for the new question type on. 
@frrrances - could you take a look through the FED work here. A lot was moved around, but feel free to comment on anything and I'll work towards cleanup (or specifically listing out follow-up FED cleanup for styling I didn't actually edit in a separate story. Thanks! 

Old: https://www.dropbox.com/s/6l7np6r2izl5trk/Screenshot%202014-07-09%2013.55.54.png
New: https://www.dropbox.com/s/xzke3uqh6mabebz/Screenshot%202014-07-09%2014.58.15.png
New: 

I get where you're coming from, but there are a variety of reasons we might want to involve css, like toggling display none/block may not be the right thing for the layout, we may want to toggle several elements at the same time (if you toggle a class on a parent, you can change many elements within at the same time), using simple css transitions, or changing how do we do display none (zero height or whatever). I'm happy to discuss more offline...