* Closed #65: Now the select(), filter(), order_by(), page(), limit(), random() methods can be applied to collection attributes
* Closed #105: Now you can pass globals and locals to the select() function
* Improved inheritance support in queries: select(x for x in BaseClass if x.subclass_attr == y)
* Now it is possible to do db.insert(SomeEntity, column1=x, column2=y) instead of db.insert(SomeEntity._table_, column1=x, column2=y)
* Discriminator attribute can be part of the composite index
* Now it is possible to specify the attribute name instead of the attribute itself in composite index
* Query statistics: global_stats_lock is deprecated, just use global_stats property without any locking
* New load() method for entity instances which retrieves all unloaded attributes except collections
* New load() method for collections, e.g. customer.orders.load()
* Enhanced error message when descendant classes declare attributes with the same name
* Fixed #98: Composite index can include attributes of base entity
* Fixed #106: incorrect loading of object which consists of primary key only
* Fixed pony.converting.check_email()
* Prefetching bug fixed: if collection is already fully loaded it shouldn't be loaded again
* Deprecated Entity.order_by(..) method was removed. Use Entity.select().order_by(...) instead
* Various performance enhancements
* Multiple bugs were fixed