No need to set date in the gemspec.

The default is to set the current time / date. The version of rubygems
that is currently shipping with 2.0 no longer requires date before
loading the gemspec so `Date.today` isn't available.
Update attribute should return true / false if it could update.

It is theoretically possible that the new value could be nil for all
options meaning that `@updated` would be false / nil even after a
successful run.
Merge pull request #136 from collectiveidea/ruby-2.0.0

Compatibility fixes for Ruby 2.0 (rc2)