Update fix SQLAlchemy support with ORM (#30)

✨ SQLAlchemy ORM support

Improved jsonable_encoder with SQLAlchemy support, tests running with SQLite, improved and updated SQL docs

* ➕ Add SQLAlchemy to development dependencies (not required for using FastAPI)

* ➕ Add sqlalchemy to testing dependencies (not required to use FastAPI)

scripts/test.sh

@@ -6,6 +6,11 @@ set -x
 export VERSION_SCRIPT="import sys; print('%s.%s' % sys.version_info[0:2])"
 export PYTHON_VERSION=`python -c "$VERSION_SCRIPT"`
 
+# Remove temporary DB
+if [ -f ./test.db ]; then
+    rm ./test.db
+fi
+
 export PYTHONPATH=./docs/src
 pytest --cov=fastapi --cov=tests --cov=docs/src --cov-report=term-missing ${@}
 mypy fastapi --disallow-untyped-defs