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