Fix unintended relation to users when a model uses HasPermissions trait

[brandonlim-hs]

Description

Moved users method from HasPermissions trait to Role model. The list of users related to Role or Permission are still accessible from the respective models. For example, $role->users and $permission->users

Motivation and context

Models that use HasPermissions trait should not unintentionally be related to User model. fixes #94

How has this been tested?

Added additional tests to assert that a model that uses HasRoles or HasPermissions trait does not have users method

/** @test */
public function a_model_that_uses_hasPermissions_trait_should_not_have_users_method()
{
    $this->assertFalse(method_exists($this->testUser, 'users'));
}

/** @test */
public function a_model_that_uses_hasRoles_trait_should_not_have_users_method()
{
    $this->assertFalse(method_exists($this->testUser, 'users'));
}

Screenshots (if appropriate)

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[coveralls]

Coverage remained the same at 100.0% when pulling cc21354 on brandonlim-hs:bugfix-unintended-users-relation into 954633b on mostafamaklad:master.

[coveralls]

Coverage remained the same at 100.0% when pulling cc21354 on brandonlim-hs:bugfix-unintended-users-relation into 954633b on mostafamaklad:master.