some update & multiple pdo adapters

1. implemented comment removing
2. improve the code formator
3. add GroupRoleManager
4. add getImplicitRolesForUser and getImplicitPermissionsForUser
5. join the cache after persisting the policy
6. saveModelToText() and savePolicyToText().
7. fixed escape assertion
8. new adapters supported, (PDO: MySQL, PostgreSQL, SQLite, SqlServer)
9. some update or bug fix
10. It's very similar to JCasbin Version 1.4.0

bug fix

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and to &&

init filter support

1. unit tests for domain resource roles
2. unit tests for resource roles
3. init filter support

$filter = [];    // the filter for policy to load

$adapter = new AdapterFiltered(‘table_name’, $filter);

$god = new God(‘path_to_model.conf’, $adapter);

bug fix and php version change

1. var_export does not handle circular references.
2. update phpunit to 7.2, php to 7.2

readme update

1.0.1

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God bless you!

does "Who" as "Role" or "Group" from "Where" do "Operator" to "What" will got "How"?