fixes regression caused 92c33a2
Use bundler gem tasks
Bundler provides rake tasks for build, install, & release: $ rake -T | grep gem
Fix Minitest base class warnings by creating a Haml::TestCase base class that inherits from the latest Minitest base class available. Background: ActiveSupport 4.1 depends on mintiest 5.x, which uses Minitest::Test as the base test class. ActiveSupport 4.0 depends on mintiest 4.x, which uses MiniTest::Unit::TestCase as the base class. Rails 3.2 uses Test::Unit::TestCase defined by stdlib. There is no gem dependency on minitest in Rails 3.2, nor is there a gem dependency on test-unit.
Remove ruby 1.9.2, which is unnecessary since we're testing against 1.9.3. We should only test against each latest minor version of ruby. Temporarily allow failures for rubinius, since there are errors installing rubinius 2.2.6 on Travis now.
Remove FormFor Helper
…to the form's input.
HTML escape interpolated code in filters
HTML escape any interpolated code if the escape_html option is set.
…since #form_for uses #form_tag we can rely on the patched #form_tag_with_haml to indent the form correctly.
This was removed in bcc3dd8 but is still needed.
define_callback is from Sass and is not used in Haml.
The documentation update explaining the new handling of hash valued attributes included changing the heading for that section, which means the generated `id` value will also change and any existing links using the old value will stop wotking. Add a new (hidden) link target at the same point with the old `id` so that those links will continue to work.