Fix uima annotator

The dbpedia-spotlight UIMA annotator didn't compile originally (with maven).

Moving the source to the correct location (according to maven conventions) and changing the logger are necessary to make it compile.

Changing the scope of the uimaj-core dependency is necessary for it to work correctly when packaged as PEAR.

Using PARAM_* variables makes it safer (avoid typos) to use the parameter names from Java, and is needed for UIMAfit to do some "magic". Also, in particular for UIMAfit, the typesystem descriptor should be bundled in the .jar file and a types.txt file included to allow automatic discovery of the type system.