Make created cache dir mask as option and default to 0777

[Vincz]

Make the created cache dir default to mask 0777 instead of 0775 to avoid permission errors on cache removal. Fix #24

[mcg-web]

Thank @Vincz for this contribution! I leave some subjection.

[mcg-web]

Since the value can be set using construct making this private in a first place could ease maintenance.

Suggested change

	protected $cacheDirMask;
	private $cacheDirMask;

[Vincz]

The problem with the suggested solution of using the constructor and letting the default to 0755 is that we would need to update also the GraphqlBundle (to add the missing parameter on extends) in order to use the new one.

Or we could use a public static property and do something like:

public static $cacheDirMask = 0755;

And to change it:

Overblog\GraphQLGenerator\Generator\TypeGenerator::$cacheDirMask = 0777;

What do you think @mcg-web ?

[mcg-web]

In GraphQL Bundle modifying this line does the work. Changing dir mask can be consider as BC since this change how files is generated so this will be release in 0.8, the bundle requires 0.7 of this lib so we must modify the bundle anyway. I prefer setting the value of cache dir mask variable only by construct since this is a configuration argument (so no need to change it on compile time). I'm no fan of the global static variable since you loose flexibility between different instances.

[Vincz]

Hey @mcg-web ! I'll add a PR on the bundle when this one will be merge and a new version set.

[mcg-web]

Done @Vincz! The bundle fix should be submit for 0.11 version. Thanks again for your contribution!