fix(im): in vkMakeMsgHistory adjust to new API response format

This closes #82.
fix(im): in vkMakeMsgHistory fix variable names from overwriting
refactor(im): in vkMakeMsgHistory don't defer next step by 300ms

setTimeout here is used to avoid "Too many requests per second" error
which is already handled by app.vkApi module.

This change actually speeds up history saving process by 40%!
refactor(im): in vkMakeMsgHistory raise message limit per request to 200

This change actually speeds up history saving process by another 50%!
It now takes only ~30% time to save the same history (see prev commit).
fix(audio): reduce audio title size on user pages

This closes #80.
refactor(im): optimize vk_messages.get_history()

- don't defer next step by 350ms
- raise message limit per chunk to 200
- raise chunk limit per request to 20

See also: eea04629ec5f030b90bb209bf5d3b1404aa8aeac and c1e80e97184338b56054a692f68e739adb7996e2
chore(meta): bump version to 0.3.2