features 6.x-1.0-beta7

This release contains many important fixes and some new features. Many thanks to all the contributors and users who provided patches and bug reports.

• #778250: Fix for php 5.3 issue with CTools.
• Added static cache to ensure features_include() runs only once.
• #522794 by Skorpjon, kenorb: Fixes for tar archive creation.
• #686240 by David Stosik: Ensure field settings are properly captured accross instances.
• Add the drush features-update-all command and switch to using
  drush_invoke_backend() to ensure processes have a better memory footprint.
• Standardize CTools API identifier to fully support non-exportables CTools APIs.
• Ensure dependencies added by CTools do not create circular dependencies.
• #798104 by Steven Merrill: Add drush features-revert-all command.
• #673234 by joshk: Use elseif instead of else if to comply with coding standards.
• Support additional CTools plugin APIs that are non-exportable based.
• #722460 by scor: Use 'drupal dependencies' flag in hook_drush_command() to ensure features is enabled.
• #727110 by adixon: Respect drush --root option.
• #726700: Context 3.x dependency & component detection.
• #709608: CTools: don't re-export objects that already exist in code. Depends on #709754.
• Disable features before installing on submit.
• #725132 by q0rban: Fix for fieldgroup duplicate entries.