first release - megalist

[rnmp]

all things required to go live publicly as follow:

• [x] pagination
• [x] nested comments
• [x] validations (including prevent comment AND url per convo)
• [x] markdown
• [x] prevent voting more than once per convo
• [x] finish all sorting (popular vs. recent) in convo
• [x] finish all sorting (popular vs. recent) in comments
• [x] thumbnails for links
• [x] differentiate url vs self posts
• [x] enhance "popular" algorithm for convos so old convos don't show up (age weight)
• [x] validation error due to smart_add_url_protocol

[rnmp]

archived in favor of milestone