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

Check whether blocks are called from erb using a special __in_erb_template variable visible in block binding.

Move erb_trim_mode setting to the ERB template handler. Keep a Base.erb_trim_mode= delegator around.