railties is a better indicator of the rails gem

people are building rails apps that don't include the rails
meta gem. railties is not used outside of rails and can be
used to indicate the version of rails being used.
check that the Gemfile + Gemfile.lock exist before trying to read those files
rails 2 doesn't have railties
bump to v53
update changelog
upgrade to bundler 1.3.2
bump to v54
update changelog
Revert "upgrade to bundler 1.3.2"

This reverts commit 4091c08b58eecbbdff0288c8723522e9b08c541d.
bump to v55
update changelog
Revert "Revert "upgrade to bundler 1.3.2""

This reverts commit 3fc9718e47cff36e30acc4c305994cff75c19f14.
require psyched_yaml in the syck hack
ruby 1.8.7 doesn't autoload rubygems
bump to v56
update changelog
Update link to vulcan gem
Merge pull request #73 from sumbach/patch-1

Update link to vulcan gem in README
write bundler version
Fix bundler git gemspec bug.

Bundler 1.3.0.pre.8 broke backwards compatibility with gemspecs.
6548e31e8ad061403d65505d7d2e17c489b262cc changes how gemspecs are being
generated which is causing problems with git gemspecs that are not self
contained. See https://gist.github.com/hone/5043f02bea633fd1a844 for the
differences in the gemspec.