[doc] fix sphinx warnings

doc/extra-intersphinx.txt

+sqlalchemy

doc/index.rst

@@ -21,15 +21,13 @@ If you use this database in your publication, please cite the following paper on
 TODO: Should be changed 
 .. code-block:: latex
 
-  @INPROCEEDINGS{Chingovska_BIOSIG-2012,
-    author = {Chingovska, Ivana and Anjos, Andr\\'e and Marcel, S\\'ebastien},
-    keywords = {biometric, Counter-Measures, Local Binary Patterns, Spoofing Attacks},
-    month = september,
-    title = {On the Effectiveness of Local Binary Patterns in Face Anti-spoofing},
-    journal = {IEEE BIOSIG 2012},
-    year = {2012},
-  }
-
+    @INPROCEEDINGS{Chingovska_BIOSIG-2012,
+      author = {Chingovska, Ivana and Anjos, Andr\\'e and Marcel, S\\'ebastien},
+      keywords = {biometric, Counter-Measures, Local Binary Patterns, Spoofing Attacks},
+      month = september,
+      title = {On the Effectiveness of Local Binary Patterns in Face Anti-spoofing},
+      journal = {IEEE BIOSIG 2012},
+      year = {2012},}
 
 Documentation
 -------------

doc/nitpick-exceptions.txt

+py:class bob.db.base.file.File
+py:class bob.db.base.database.Database
+py:class sqlalchemy.ext.declarative.api.Base