Corrected ProgrammingError COALESCE types
Corrected ProgrammingError COALESCE types

This commit should correct the following error:
	ProgrammingError at /community/

	COALESCE types boolean and integer cannot be matched
	LINE 1: SELECT (coalesce(expiration_date > '2015-07-14', 1)) AS "not...

The error was caused by difference in how Postgres and Sqlite stores boolean values
('t' in Postgres and '1' in Sqlite). The coalesce fuction was changed to contain
the following expression '1=1'.

patjouk/djangogirls,DjangoGirls/djangogirls,patjouk/djangogirls,DjangoGirls/djangogirls,patjouk/djangogirls,patjouk/djangogirls,DjangoGirls/djangogirls