oops, move deprecation warning out of test and into code

version bump

version bump for performance regression

version bump for regression

version bump for UA sniffing

bump to 2.4.0

Bump minor version for new header_hash feature

Merge pull request github#165 from twitter/kill-1.8.7

Print deprecation warning for 1.8.7 users.

version bump

Merge pull request github#153 from twitter/coveralls-for-alls

cover more ruby versions with coveralls, don't error out on 1.8.7