add Rails 4 to compatibilty in README
drop 1.8.7, ree and 1.9.2 from travis
minimum Ruby 1.9.3
no need to be strict on nokogiri version now that we're on 1.9.3 only
remove Rails 3.0 and 3.1 from Appraisals
require actionpack >= 3.2
drop 3.0 and 3.1 from .travis.yml
drop Rails 3.1 code path for CSS files in install generator
fix generator comment
rails 3.1 introduced button_tag, no need for work-around
Add Ruby 2.1.0 to .travis.yml
add rails4-mri2.1.0 to allow to fail
Merge pull request #982 from salimane/pr_ruby_2_1_0

Add Ruby 2.1.0 to .travis.yml build matrix as "allowed to fail"
Whitelist only `for` and `class` attributes on BooleanInput label.

I can't find a decent reason to be merging with `input_html_options` and fussing around with it like it was.

Closes #995
deprecate anything under Rails 3.2.13 (where hidden fields were intro'd)
Allows to disable model infered class from form
Renames variable, adds tests and documentation
Merge pull request #1019 from justinfrench/deprecate-rails-3-2-12

Deprecate anything under Rails 3.2.13
Merge branch 'master' into drop-rails-30-and-31

Conflicts:
	gemfiles/rails_3.0.gemfile
	gemfiles/rails_3.1.gemfile
bump actionpack dependency to 3.2.13