load previous archive with utf-8 encoding

Copied from model.rb's File.read
Merge pull request #54 from Stawberri/archive_read_encoding

load previous archive with utf-8 encoding
add note to readme about regenning models
README tweaks
Removed reply_prefix from examples

These methods now automatically add in reply_prefix in v3.
conditional reply_prefix for replies

Reply prefix is now only added if the recipient's screen_name isn't
already in the tweet text.
Merge pull request #57 from Stawberri/remove_reply_prefix_examples

Removed reply_prefix from examples
Merge pull request #58 from Stawberri/conditional_reply_prefix

Conditional reply_prefix for replies
fix README quote inconsistency
Add default delay range, configure check
3.0.5
Less sensitive bot detection
Update tests to account for bot detection
Another attempt at resolving conflict.

This is probably going to fail and I'm going to need to do another
commit again, aren't I?