Improved en_AU provider and added related unit tests

[jremes-foss]

Hi.

Looks like en_AU provider needed some attention.

1. Added some provider methods for src/Faker/Provider/en_AU/Address.php file.
2. Created provider test class to test/Faker/Provider/en_AU/AddressTest.php
3. Created test methods to test/Faker/Provider/en_AU/AddressTest.php in order to test that the results are sane.

Thank you.

[jremes-foss]

Looks like there is a space issue with CodeSniffer:

FILE: ...home/travis/build/fzaninotto/Faker/src/Faker/Provider/en_AU/Address.php
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FOUND 4 ERROR(S) AFFECTING 4 LINE(S)
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  81 | ERROR | Line indented incorrectly; expected at least 8 spaces, found 6
  90 | ERROR | Line indented incorrectly; expected at least 8 spaces, found 6
  99 | ERROR | Line indented incorrectly; expected at least 8 spaces, found 6
 108 | ERROR | Line indented incorrectly; expected at least 8 spaces, found 6
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UPGRADE TO PHP_CODESNIFFER 2.0 TO FIX ERRORS AUTOMATICALLY
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[fzaninotto]

Thanks!