[loader] remove deprecated phpcr loader
Merge pull request #292 from formapro-forks/data-loader-remove-deprecated-loader

[1.0][loader] remove deprecated phpcr loader
[tests] increase code coverage by tests.
Merge pull request #290 from formapro-forks/helere-tests

[1.0][tests] increase code coverage by tests.
[data loader] rework to return binary instance. add mime type guesser.
Merge pull request #291 from formapro-forks/mime-type-guesser

[1.0] Rework data loaders. Introduce mime type guesser.
[filter-manager] do not apply filters on "get" method call. allow pass runtime config.