use the previous incarnation of #input_class for FormBuilder

For some reason, Formtastic checks if a constant is defined first, which doesn't play nicely with autoloading of custom inputs. This brings Formtastic's implementation back to pre justinfrench/formtastic#783
update to rspec-rails 2.13
get the test suite passing for Rails 4

:purple_heart:
Adds permitted params for admin_user for rails 4
update gemspec requirements to prevent errors

Since our major dependencies now have official rubygems releases that
support both Rails 3.2 and 4.0, I'm making those new versions a
requirement in the gemspec.
fix issue where AA test app couldn't find assets
lazy-load the sort order to prevent hitting the DB in rake tasks

resolves #2342
#2329: remove app/admin from eager_load_paths
Merge pull request #2369 from RobotsAndPencils/batch-docs-update

Batch Actions and Custom Actions
Merge pull request #2471 from vfonic/patch-1

Add AuthorizationAdapter documentation to initializer
align gemspec dependencies
remove fastercsv from gemspec
provide more pessimistic version requirements
alphabetize the gemspec
authorization adapter cleanup
add failing tests
fix two filter bugs

1. custom search methods should be able to be used for string filters
2. the `include_blank` option should always be respected
Use https for RubyGems.org.
Merge pull request #2489 from Daxter/bugfix/filters

Fix two filter bugs
Automatically load the CanCanAdapter if CanCan is given

This resolves #2473 by discretely loading the adapter instead of
waiting on class autoloading.