Merge pull request #256 from sminnee/deprecate-pdo

NEW: Change .env.example to default to MySQL native driver

.env.example

@@ -2,7 +2,7 @@
 # https://docs.silverstripe.org/en/4/getting_started/environment_management/#core-environment-variables
 
 # DB credentials
-SS_DATABASE_CLASS="MySQLPDODatabase"
+SS_DATABASE_CLASS="MySQLDatabase"
 SS_DATABASE_SERVER="localhost"
 SS_DATABASE_USERNAME="<user>"
 SS_DATABASE_PASSWORD="<password>"