Silence MooseX::Attribute::Chained warnings with HTML::FormFu 2.0+.

When I use this module with HTML::FormFu 2.-+ I get spammed with these warnings:

Implicit use of the Chained trait is deprecated. Please load MooseX::Attribute::Chained explicitly at /usr/local/share/perl/5.14.2/Moose/Meta/Attribute/Custom/Trait/Chained.pm line 19, <GEN28> line 1.
 at /usr/local/share/perl/5.14.2/Moose/Meta/Attribute/Custom/Trait/Chained.pm line 19, <GEN28> line 1.

HTML::FormFu 2.0 introduced MooseX::Attribute::FormFuChained which, if this module uses it, fixes the warnings.

I also fixed the Changes file which was missing the tag from the last release (1.00), and added /.build to .gitignore so that the dzil builds do not get tracked by git.