Issue #1015946 by pillarsdotnet, catch, bfroehle, Jej, jose.guevara, Damien Tournoud: Fixed Eliminate ->cache and {session}.cache in favor of ['cache_expiration()'][].
Issue #135: Porting Drupal Issue #1015946 tests. Fixed Eliminate ->cache and {session}.cache in favor of ['cache_expiration()'][].
Merge pull request #173 from quicksketch/jenlampton-135-meta3-jen6

Issue #1015946 by pillarsdotnet, catch, bfroehle, Jej, jose.guevara, Damien Tournoud: Fixed Eliminate ->cache and {session}.cache in favor of ['cache_expiration()'][].
Issue #136: Introduce tempstore table and functionality for reusable temporary storage.
Issue #187: Backport #wrapper_attributes to allow adding classes on form element wrappers.
Issue #190: Early PHP 5.3.x compatibility issue in Entity class.
Merge pull request #177 from quicksketch/abstract_inheritance

Issue #190: Early PHP 5.3.x compatibility issue in Entity class.
Merge pull request #175 from quicksketch/wrapper_attributes

Issue #187: Backport #wrapper_attributes to allow adding classes on form element wrappers.
Merge pull request #174 from quicksketch/136/object_storage

Issue #136: Introduce tempstore table and functionality for reusable temporary storage.