merge revision(s) 39321:

	* ext/bigdecimal/bigdecimal.gemspec: bump to 1.2.0.
	  [ruby-core:51777] [Bug #7761]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39416 b2dd03c8-39d4-4d8f-98ff-823fe69b080e