Add support for Samus (http://github.com/lsegal/samus)
i18n: Fill "POT-Creation-Date" header value

It should be the time of the .pot is created. The current
implementation uses the static value. (It was my mistake. Sorry.)
rake gem: Support RubyGems 2.0.0 or later

RubyGems 2.0.0 changed API to create gem:

http://rubygems.rubyforge.org/rubygems-update/History_txt.html

> 2.0.0 / 2013-02-24
>
> * Merged Gem::Builder into Gem::Package.
>   Use Gem::Package.build instead of Gem::Builder.new(spec).build
Merge pull request #741 from kou/i18n-fill-pot-creation-date

i18n: Fill "POT-Creation-Date" header value
Merge pull request #742 from kou/work-rake-gem-with-latest-rubygems

rake gem: Support RubyGems 2.0.0 or later
Rewrite rake gem task
Fixed issue #744 by making the 'frames' link have a relative URL instead of an absolute one.
Merge pull request #745 from DavidEGrayson/yard_pull_request_frames

Fixes #744 by making the 'frames' link have a relative URL
Merge branch 'master' of github.com:lsegal/yard
Removed my jeweler stuff.

Conflicts:
	Gemfile
	Rakefile
Added back yard.gemspec so my fork can be as close as possible to Loren Segal's official version.  Added deg-yard.gemspec since we are not using Jeweler anymore.
Removed some of my changes from doc_manager_spec.rb.