2015-10-09  Paul Schneider  <paul@pschneider.fr>

	* NpgsqlBlogProvider.cs: - Fixes access on bills
	- Fixes usage of bill without photo

2015-10-08  Paul Schneider  <paul@pschneider.fr>

	* NpgsqlBlogProvider.cs: Fixes last commit in case of DBNull
	reading the photo

2015-10-08  Paul Schneider  <paul@pschneider.fr>

	* NpgsqlBlogProvider.cs: implements a blog post photo storage