bump rails to 2.3.18
Don't pass default_url to gravatar URI in test mode as it will fail

Because testhost.tld does not host gravatar images..
See also https://github.com/radiant/radiant/commit/59cbb8cc8a7ccdeeca2614066d845c6cb62b1523
Set up travis to build the 1.x branch
Make Travis not use --deployment flag on bundle install

In order to prevent this build error;
https://travis-ci.org/radiant/radiant/jobs/10793199#L30

See https://groups.google.com/forum/#!topic/travis-ci/XID21_FwgX8
note change in rails version
remove ZenTest
attempt to patch the missing rubygems features required by rails 2
ensure the proper namespace is used for rubygems patches
fix syntax error in overriding Gem.source_index
attempt to fix build in travis
remove hacks for rubygems and only support version 1.8
Get spec:lib running again after the removal of ZenTest
Remove Gemfile.lock during before_install
Don't use --deployment during bundle install
Trigger travis on ci branch
Downgrade RubyGems