Resolve multiple PRs

[SOHELAHMED7]

Resolve - Prevent _id suffix in column name on reference properties

Fix https://github.com/cebe/yii2-openapi/issues/90

PR in fork: https://github.com/SOHELAHMED7/yii2-openapi/pull/21

---

Resolve: Running phpunit second time fails a tests

Fix: https://github.com/cebe/yii2-openapi/issues/139

PR in fork: https://github.com/SOHELAHMED7/yii2-openapi/pull/20

---

Resolve: If data type is not changed then still migrations are generated for timestamp in MySQL

Fix https://github.com/cebe/yii2-openapi/issues/143

PR in fork: https://github.com/SOHELAHMED7/yii2-openapi/pull/24

---

Resolve: Model name generated more than once in Faker

Fix https://github.com/cebe/yii2-openapi/issues/148

PR in fork: https://github.com/SOHELAHMED7/yii2-openapi/pull/25

---

Resolve: Wrong migration for Pgsql is generated for string/varchar datatype

Fix https://github.com/cebe/yii2-openapi/issues/149

PR in fork: https://github.com/SOHELAHMED7/yii2-openapi/pull/26

---

Resolve - PathAutoCompletion causes timeouts on large projects

Fix https://github.com/cebe/yii2-openapi/issues/145

PR in fork: https://github.com/SOHELAHMED7/yii2-openapi/pull/27

---

Resolve - nullable false should put attribute in required section in model validation rules

Fix #153

PR in fork: https://github.com/SOHELAHMED7/yii2-openapi/pull/28

[cebe]

Thank you!