Use Mt for email addresses.
Add support stuff for Ruby 2.0.0.
Add ruby200-base-2.0.0p247.

This is latest stable release of Ruby and it basically compatible with
Ruby 1.9.3.  Please refer full changes to NEWS/ChangeLog files or official
Web site.  Here is language changes:

* Added keyword arguments.

* Added %i and %I for symbol list creation (similar to %w and %W).

* Default source encoding is changed to UTF-8. (was US-ASCII)

* No warning for unused variables starting with '_'
Add ruby200 support.
Note addition of lang/ruby200-base version 2.0.0p247 package.
Add and enable ruby200-base.
Add ruby200 package.  This is a meta package for Ruby 2.0.0.
Add and enable ruby200.
Note addition of lang/ruby200 version 2.0.0p247 package.
Tweak GEM_CLEANBUILD for ruby200.
Tweak GEM_CLEANBUILD for ruby200 and enable with ruby200.
Use RbConfig instead of legacy Config.
No need to specify GEM_CLEANBUILD.
Tweak GEM_CLEANBUILD for ruby200.
Enable ruby200.
Tweak GEM_CLEANBUILD for ruby200.
Fix for ruby200.

It isn't very good practice to depend on parenthesis by CPP macro for
"if" statement of C language although CPP macro should be use parenthesis
after expanded.
Enable ruby200.
Use RbConfig instead of legacy Config.
Enable ruby200.