2015-06-07  Paul Schneider  <paul@pschneider.fr>

	* CalendarController.cs: removes useless spaces

	* FrontOfficeApiController.cs: Makes the tex to pdf exceptions
	available to the user interface, as part of the application
	process.
	Cleans the using clauses. 

	* TexToPdfFormatter.cs: sets the filename as response header.

	* Web.csproj: a new FormatterException, thrown when exit code
	of texi2pdf is not null