Added FormTagHelper that provides a number of methods for creating form tags that doesn't rely on conventions with an object assigned to the template like FormHelper does. With the FormTagHelper, you provide the names and values yourself.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@687 5ecf4fe2-1ee6-0310-87b1-e25e094e27de