Upgraded to the latest conformance suite
Do not update conformance tests in test:conformance rake task.
Update rubygems on Travis CI to fix build failure on Ruby 1.8.7.

Can be reverted once new Ruby VMs are deployed to Travis CI (see
https://github.com/travis-ci/travis-ci/issues/1793#issuecomment-31369335
for more information).
Do not downcase usernames during linkification.
Fix link_to_screen_name RSpec matcher.
Show build status for master branch.
Conformance tests fix for Ruby 1.8 (properly loading escaped Unicode from YAML).
Fix conformance test methods being overridden.
Merge pull request #109 from twitter/fixes_for_travis_ci

Fixes for Travis CI