Update tests so they pass on master branch

Note: Tests will fail on PHP 5.6

added correct group declarations to tests

Fix tests for changed HTML output in DokuWiki

Migrate tests to PHPUnit (used in development version of DokuWiki)

Implemented test cases for nested includes, see issue #21

These test cases partially fail, I get from 8 to 16 failing tests from
a total of 24 tests. I don't know why these number differ so much as

Implemented test cases for nested includes, see issue #21

These test cases partially fail, I get from 8 to 16 failing tests from
a total of 24 tests. I don't know why these number differ so much as
theoretically all data that influences the test should be removed
before/after each test cases.

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