Merge branch 'release/20130213-release'

* release/20130213-release: (55 commits)
  bump version to 0.0.3
  bugfix: assets are already precompiled, shared assets should only be prepended to the "before_migrate.rb" file
  update rails to version 3.2.12
  separates dashboard assets from application assets
  adds info rake tasks to get a quick overview of attributes and obj_classes for a given workspace
  simplifies attribute migration generation and adds tests
  improves performance for all objects (suggested by OEW)
  extends BoxImage to have a link attribute that defines if and where the displayed image links to
  adds support for a redirect object
  updates CHANGELOG
  shares assets between deployments
  uses ruby 1.9 hash syntax and minor changes
  updates ruby version to 1.9.3-p327
  updates CHANGELOG and minor changes
  refactors user management
  refactors authorization into before filter
  renames user_presenter to login_presenter
  rbenv: removed existing '.rbenv-version' file and migrated local version specification to '.ruby-version' file
  refactoring: it seems to be more common to depend on "consider_all_requests_local" instead of the rails environment
  bugfix: correct contact_page_generator_spec name
  ...