In case of updating a model, generator creates redundant inverse relations

[SOHELAHMED7]

It seems like this bug is introduced by #26

Steps to reproduce:

• A model is already present with relation (hasMany)
• run generator $ ./yii gii/api --ignoreSpecErrors
• a relation where inverse relation is needed is changed. This is OK
• few other redundant relations are generated. This is not OK

I will create a failing test which will describe this issue in more detail

[SOHELAHMED7]

Failing test is at b050abd