Consolidate CustomHandlerTest, TemplateFileTest, and TemplateObjectTest and test them at a higher level of abstraction in ViewRenderTest.

Patched HTML::Document#initialize call to Node.parse so that it includes the strict argument. [#330]

[#370 state:resolved]

This reverts commit 4d5ac3f3.

Example usage:
polymorphic_url([:admin, @user, :blog, @post]) # => admin_user_blog_post_url(@user, @post)

[#461 state:resolved]

For example :conditions => ['stringcol::integer = :var', { :var => 10 }]
will no longer raise an exception about ':integer' having a missing value.

Performance: javascript helper tweaks to speed up escaping and reduce object allocations when building options strings