Add tests for Schematron generation.

[baerrach]

Code for working on https://github.com/phax/ph-schematron/issues/25

Note: None of the test have assert/fails yet.

MavenPluginSchematronTest fails because of no namespace prefixes.

XlstSchematronTest succeeds because it has correct namespace prefixes.

PHSchematronTest is an attempt to write tests closer to the guts of where the code does the work as the MavenPlugin is too high level.

• testPHSchematronDirectlyOutputViaXMLWriter (fails no namespaces)
• testPHSchematronDirectlyOutputViaTransformer (succeeds)
• testPHSchematronDirectlyOutputViaXMLWriterWithNamespaces (an attempt to configure with correct options to generate correctly)

[codecov-io]

Current coverage is 54.78%

Merging #26 into master will decrease coverage by 1.04%

@@             master        #26   diff @@
==========================================
  Files            99        103     +4   
  Lines          4007       4200   +193   
  Methods           0          0          
  Messages          0          0          
  Branches        871        894    +23   
==========================================
+ Hits           2237       2301    +64   
- Misses         1447       1561   +114   
- Partials        323        338    +15   

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