Add support for normalization test suite.

- Handle rdfn:Urgna2012EvalTest and rdfn:Urdna2015EvalTest.
- Use nquads input format for normalization tests.
- Support normalization test suite format with various tweaks.
  Compacting the data would eliminate most of these changes but can't
  rely on compact to work in the code that tests compact! So hard coded
  fixes are used.
  - Support 'entries' and 'sequence' for tests.
  - Support 'include' as filename without a .jsonld extension.
  - Support 'type' and '@type' as aliases.
  - Support 'id' and '@id' as aliases.
  - Support 'action' and 'input' as aliases.
  - Support 'result' and 'expect' as aliases.
  - No longer strip '#t' prefix from '#tNNN' ids.
  - Default to positive test if nothing specified.
- Add normalization test to travis-ci config.
- Fix container infrastructure flag from 'root' to 'sudo'.
- Update README with new testing info.

README.md

@@ -171,14 +171,16 @@ This library includes a sample testing utility which may be used to verify
 that changes to the processor maintain the correct output.
 
 To run the sample tests you will need to get the test suite files by cloning
-the [json-ld.org repository][json-ld.org] hosted on GitHub:
+the `json-ld.org` and `normalization` repositories hosted on GitHub:
 
-https://github.com/json-ld/json-ld.org
+- https://github.com/json-ld/json-ld.org
+- https://github.com/json-ld/normalization
 
-Then run the PHPUnit test.php application and point it at the directory
-containing the tests.
+Then run the PHPUnit test.php application and point it at the directories
+containing the tests:
 
     phpunit test.php -d {PATH_TO_JSON_LD_ORG/test-suite}
+    phpunit test.php -d {PATH_TO_NORMALIZATION/tests}
 
 [Digital Bazaar]: http://digitalbazaar.com/
 [JSON-LD]: http://json-ld.org/
@@ -187,4 +189,3 @@ containing the tests.
 [PHP]: http://php.net
 [RDFa]: http://www.w3.org/TR/rdfa-core/
 [RFC7159]: http://tools.ietf.org/html/rfc7159
-[json-ld.org]: https://github.com/json-ld/json-ld.org