Need a more effective way of filtering a users posts

[aaroncox]

Right now the current method is loading 100 posts from the user directly and then filtering.

This causes two problems:

1. Slower loading times since it's an ineffective way of doing this.
2. When a user has more than 100 posts, this will cause posts beyond 100 to not display if none in the first 100 match.

There may be a more effective path through using get_state on a user, and potentially having the ability to pass filter/pagination parameters along with it to use the blockchains native indexes.