Remove unused use statement
Merge pull request #815 from nicolas-bastien/patch-2

Remove unused use statement
s/PostgreSQLPlatform/PostgreSqlPlatform/
Merge pull request #824 from brikou/patch-3

s/PostgreSQLPlatform/PostgreSqlPlatform/
Second level cache
Extract cache config
Fix persister query cache invalidation
Fix CS and update docs
handle update/delete queries
Fix docs