highlevel functions

[arademaker]

related to #21 , we need some high-level functions over the transformations. For instance, in #21 I discussed the possible demand for a simplifier RDF. In #24 we discussed redundancy that we may also want to remove (with an extra parameter?). We also have to consider that the CLI use case, the batch transformation of a profile to RDF, is not the only use case for this plugin. Consider the programmatic transformation of sentences in a Python code calling Ace interactively, how to encode the sentence input text? Currently, the solution for that would be outside this library.