entity 7.x-1.0-beta10

Changes since 7.x-1.0-beta9:

• #1208864 patch by Damien Tournoud: API change: extended entity_view() to allow the caller to set the 'page' flag when rendering an entity.
• improved list-wrappers to not try to load empty lists of entities.
• #1191398 patch by fago, dixon_: Adding entity to list causes WSOD.
• #1211946 fixed Rules integration for provided entity-types to be invoked last.
• #1208514 Entity object serialization is unnecessarily fat.
• #1203808 patch by fago: fixed validating and unsetting multipe-value properties. Also fixed field properties to be properly marked as required.
• #1178052 patch by klausi, fago: fixed unsetting entity references with the property wrappers and added a test case for it.
• #1027908 follow-up by xatoo: fix save() of exportables to properly pass through the return value.
• fixed type() method of generic entity wrappers
• #1193862 patch by Cyberwolf: Entities are exported by Features with their numeric IDs instead of machine names.