Add type integer for pin_priority

[Alukardd]

I think the pin_priority should be only Integer type, but for backwards compatibility I make it String or Integer.

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[Alukardd]

I've already signed ICLA and connected my account to GitHub.

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[Alukardd]

I also fix a problem with apt_preferences. From man page:
Note that the files in the /etc/apt/preferences.d directory are parsed in alphanumeric ascending order and need to obey the following naming convention: The files have either no or "pref" as filename extension and only contain alphanumeric, hyphen (-), underscore (_) and period (.) characters. Otherwise APT will print a notice that it has ignored a file, unless that file matches a pattern in the Dir::Ignore-Files-Silently configuration list - in which case it will be silently ignored.

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[lamont-granquist]

For the first issue its generally better to be strict about types when possible. For the second issue, it states that the files have either no or "pref" as filename extension so no extension still works fine.