Forward-porting sid collision handling
Slightly simplifying loop break logic to match rack session's
Switching out logging with callbacks, updating docs
Changes per feedback on #23
Removing reference to `:raise_errors` option, wherps!
Assigning a local for `sid` to DRY up a smidge
Rejiggering implementation of `sid_collision?` per feedback
Fixing `sid_collision?` one more time to return what I'd meant to return
Back to the double negation
Adding CHANGELOG.md and bumping version to v0.5.0
Merge pull request #23 from modcloth/forward-ported-incremental-paranoia

Forward-porting sid collision handling