Fix project being broken.

- The commit 456d657ca9fb3da6bccd2445d58e4e5790697d2d broke the project
file by setting the OPFQuestionsViewController.xib to NULL.
- The bug showed itself when you tried to show the questions view, the
app would crash and complain that the xib file didn’t exist in the bundle.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>
Fix warning about baseSQL not being implemented.

- Just got tired of seeing it, will halt at an assertion if called
(although only in debug mode, otherwise it will just return an empty
string and log an error message to the standard output).

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>
Merge branch 'master' into feature/search-questions-by-tag

* master:
  Fix warning about baseSQL not being implemented.
  Fix project being broken.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>

Conflicts:
	Code Stream.xcodeproj/project.pbxproj