Merge #1166 Ignore some SQLAlchemy DeprecationWarnings

tox.ini

@@ -21,7 +21,10 @@ usedevelop = true
 sitepackages = true
 deps = -r{toxinidir}/test-requirements.txt
 commands =
-    py.test -v {posargs}
+    py.test -v \
+        -W "ignore:Use .persist_selectable:DeprecationWarning" \
+        -W "ignore:The ConnectionEvents.dbapi_error() event is deprecated and will be removed in a future release. Please refer to the ConnectionEvents.handle_error() event.:DeprecationWarning" \
+        {posargs}
 
 [testenv:coverage]
 basepython = python2