Erased `TestBase.php` and refactored unit tests to use proper data pr…

…oviders

Fixed issue with InvalidArgumentException when a string is passed as …

…chunk-size.

Merge pull request #27 from robations/hotfix/26

Fix problem using IteratorAggregates with skip and take

Merge pull request #23 from fusonic/bugfix-chained-where-orderby

Bugfix chained where orderby. Fixes #22

Merge pull request #21 from fusonic/generator_support

Generator support

Merge pull request #11 from fusonic/spl-countable

Implemented SPL interface Countable

Rename from fusonic/fusonic-linq to fusonic/linq