Deal with path_to_match -> remaining_path method rename
Fix double escaping of & in inline mtm edit forms, fixing usage with rack 1.6.0 beta

This was definitely a bug, but for some reason it worked fine in
older versions of rack.
Explicitly set no :default_encoding in the roda tests

This fixes a test failure due to an attempt to modify a frozen
string on ruby 2.0/tilt 1.4.1.