bridge_api response size

[roadscape]

Check common calls and their response sizes. Identify if there are any low-impact methods to make responses smaller in size.

Currently, /trending is approx 1,150,961 bytes:

• 74% votes
• 19% body
• 5% json

Potential changes:

• post lists to truncate body (serve preview instead of body)
• truncate active_votes down to 5 if no observer
• do not serve json_metadata unless root comment in thread
• do not serve root_title, etc unless root comment in thread